JP7359269B2 - Terminal equipment, base station equipment, communication method and program - Google Patents

Description

The present disclosure relates to a terminal device, a base station device, a communication method, and a program.

Radio access methods and radio networks for cellular mobile communications (hereinafter referred to as "Long Term Evolution (LTE)", "LTE-Advanced (LTE-A)", "LTE-Advanced Pro (LTE-A Pro)", "New Radio") 3rd Generation Partnership Project: 3GPP). Note that in the following description, LTE includes LTE-A, LTE-A Pro, and EUTRA, and NR includes NRAT and FEUTRA. In LTE and NR, a base station device (base station) is also referred to as an eNodeB (evolved NodeB) in LTE and a gNodeB in NR, and a terminal device (mobile station, mobile station device, terminal) is also referred to as UE (User Equipment). LTE and NR are cellular communication systems in which a plurality of areas covered by base station devices are arranged in the form of cells. A single base station device may manage multiple cells.

NR is a next-generation radio access method for LTE, and is a RAT (Radio Access Technology) different from LTE. NR is an access technology that can accommodate a variety of use cases, including enhanced mobile broadband (eMBB), massive machine type communications (mMTC), and ultra reliable and low latency communications (URLLC). NR will be studied with the aim of creating a technical framework that corresponds to the usage scenarios, requirements, and deployment scenarios of those use cases. Details of the NR scenario and requirements are disclosed in Non-Patent Document 1.

In particular, URLLC requires both high reliability and short delay. Repeating retransmission over time improves reliability, but increases delay time. However, the delay time also includes the time required to retransmit data if the data is not received correctly. Therefore, in order to achieve low delay, it is important to reduce the retransmission time. Further, for data retransmission, notification of response information indicating whether or not the data has been correctly received is essential. Details of the conventional notification method of response information in LTE are disclosed in Non-Patent Document 2.

3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Study on Scenarios and Requirements for Next Generation Access Technologies; (Release 14), 3GPP TR 38.913 V14.1.0 (2016-12). 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA); Physical layer procedures (Release 14), 3GPP TS 36.213 V14.1.0 (2016-12)

However, even if the data is received correctly, if the notification of the response information is not received correctly, the data needs to be retransmitted, which greatly affects the delay time. Therefore, in order to realize URLLC, a technology that achieves both low delay and improved reliability for notification of response information is required.

The present disclosure has been made in view of the above-mentioned problems, and its purpose is to improve reliability while ensuring low delay for notification of response information in a communication system in which a base station device and a terminal device communicate. An object of the present invention is to provide a base station device, a terminal device, a communication system, a communication method, and a program that can significantly improve the transmission efficiency of the entire system by improving the communication efficiency.

According to the present disclosure, a terminal device that communicates with a base station device includes a receiving unit that receives a data channel including one or more data, and a receiving unit that receives response information for the data based on a parameter regarding reliability of the data. A terminal device is provided, comprising a transmitting section that transmits.

Further, according to the present disclosure, a base station device that communicates with a terminal device includes a transmitting unit that transmits a data channel including one or more data; A base station device is provided, including a receiving section that receives response information.

Further, according to the present disclosure, there is provided a communication method used in a terminal device communicating with a base station device, the communication method comprising: receiving a data channel including one or more data; and based on a parameter regarding reliability of the data. , and transmitting response information to the data.

Further, according to the present disclosure, there is provided a communication method used in a base station device that communicates with a terminal device, the method comprising: transmitting a data channel including one or more data; and based on a parameter regarding reliability of the data. , and receiving response information for the data.

Further, according to the present disclosure, the computer includes: a receiving unit that receives a data channel including one or more data; and a transmitting unit that transmits response information to the data based on a parameter regarding reliability of the data. A recording medium on which a program for functioning as a computer is recorded is provided.

Further, according to the present disclosure, the computer includes: a transmitter that transmits a data channel including one or more data; a receiver that receives response information for the data based on a parameter regarding reliability of the data; A recording medium on which a program for functioning as a computer is recorded is provided.

As explained above, according to the present disclosure, in a communication system in which a base station device and a terminal device communicate, the entire system can be improved by improving reliability while ensuring low delay for notification of response information. transmission efficiency can be significantly improved.

FIG. 1 is a diagram showing an example of component carrier settings in this embodiment. FIG. 2 is a diagram illustrating an example of component carrier settings in this embodiment. FIG. 3 is a diagram illustrating an example of an LTE downlink subframe in this embodiment. FIG. 4 is a diagram illustrating an example of an LTE uplink subframe in this embodiment. FIG. 5 is a diagram illustrating an example of a parameter set regarding a transmission signal in an NR cell. FIG. 6 is a diagram illustrating an example of an NR downlink subframe in this embodiment. FIG. 7 is a diagram showing an example of an NR uplink subframe in this embodiment. FIG. 8 is a schematic block diagram showing the configuration of the base station device 1 of this embodiment. FIG. 9 is a schematic block diagram showing the configuration of the terminal device 2 of this embodiment. FIG. 10 shows an example of the NR frame structure in this embodiment. FIG. 11 shows an example of reliability control of response information for data. FIG. 12 shows an example of a method for multiplexing response information that is repeatedly transmitted. FIG. 13 is a diagram illustrating an example of reliability control regarding the number of repeated transmissions. FIG. 14 is a block diagram illustrating a first example of a schematic configuration of an eNB to which the technology according to the present disclosure can be applied. FIG. 15 is a block diagram illustrating a second example of a schematic configuration of an eNB to which the technology according to the present disclosure can be applied. FIG. 16 is a block diagram illustrating an example of a schematic configuration of a smartphone to which the technology according to the present disclosure can be applied. FIG. 17 is a block diagram illustrating an example of a schematic configuration of a car navigation device to which the technology according to the present disclosure can be applied.

Preferred embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. Note that, in this specification and the drawings, components having substantially the same functional configurations are designated by the same reference numerals and redundant explanation will be omitted. Also, unless otherwise specified, the techniques, functions, methods, configurations, procedures, and all other descriptions described below are applicable to LTE and NR.

<Wireless communication system in this embodiment>
In this embodiment, the wireless communication system includes at least a base station device 1 and a terminal device 2. The base station device 1 can accommodate multiple terminal devices. The base station device 1 can be connected to other base station devices by means of an X2 interface. Furthermore, the base station device 1 can be connected to an EPC (Evolved Packet Core) by means of an S1 interface. Further, the base station device 1 can be connected to an MME (Mobility Management Entity) by means of an S1-MME interface, and can be connected to an S-GW (Serving Gateway) by means of an S1-U interface. The S1 interface supports many-to-many connections between the MME and/or S-GW and the base station device 1. Furthermore, in this embodiment, the base station device 1 and the terminal device 2 each support LTE and/or NR.

<Wireless access technology in this embodiment>
In this embodiment, the base station device 1 and the terminal device 2 each support one or more radio access technologies (RAT). For example, RATs include LTE and NR. One RAT corresponds to one cell (component carrier). That is, if multiple RATs are supported, each of those RATs corresponds to a different cell. In this embodiment, a cell is a combination of downlink resources, uplink resources, and/or sidelinks. Furthermore, in the following description, a cell compatible with LTE will be referred to as an LTE cell, and a cell compatible with NR will be referred to as an NR cell.

Downlink communication is communication from the base station device 1 to the terminal device 2. Downlink transmission is transmission from the base station device 1 to the terminal device 2, and is transmission of a downlink physical channel and/or a downlink physical signal. Uplink communication is communication from the terminal device 2 to the base station device 1. Uplink transmission is transmission from the terminal device 2 to the base station device 1, and is transmission of an uplink physical channel and/or an uplink physical signal. Sidelink communication is communication from one terminal device 2 to another terminal device 2 . Sidelink transmission is transmission from a terminal device 2 to another terminal device 2, and is transmission of a sidelink physical channel and/or a sidelink physical signal.

Sidelink communications are defined for proximity direct detection and proximity direct communication between terminal devices. Sidelink communication can use the same frame structure as uplink and downlink. Additionally, sidelink communication may be limited to a portion (subset) of uplink resources and/or downlink resources.

The base station device 1 and the terminal device 2 can support communication using a set of one or more cells in the downlink, uplink, and/or sidelink. Aggregation of multiple cells is also called carrier aggregation or dual connectivity. Details of carrier aggregation and dual connectivity will be described later. Furthermore, each cell uses a predetermined frequency bandwidth. The maximum value, minimum value, and settable value in a predetermined frequency bandwidth can be defined in advance.

FIG. 1 is a diagram showing an example of component carrier settings in this embodiment. In the example of FIG. 1, one LTE cell and two NR cells are configured. One LTE cell is configured as a primary cell. The two NR cells are configured as a primary secondary cell and a secondary cell, respectively. Two NR cells are integrated by carrier aggregation. Furthermore, LTE cells and NR cells are integrated through dual connectivity. Note that the LTE cell and the NR cell may be integrated by carrier aggregation. In the example of FIG. 1, the NR may be assisted in connection by the LTE cell that is the primary cell, so it may not support some functions, such as the ability to communicate standalone. The functions for standalone communication include functions necessary for initial connection.

FIG. 2 is a diagram illustrating an example of component carrier settings in this embodiment. In the example of FIG. 2, two NR cells are configured. The two NR cells are set as a primary cell and a secondary cell, respectively, and are integrated by carrier aggregation. In this case, the NR cell supports a function for standalone communication, thereby eliminating the need for LTE cell assistance. Note that the two NR cells may be integrated by dual connectivity.

<Radio frame configuration in this embodiment>
In this embodiment, a radio frame consisting of 10 ms (milliseconds) is defined. Each radio frame consists of two half-frames. The time interval between half frames is 5 ms. Each half frame is composed of five subframes. The subframe time interval is 1 ms and is defined by two consecutive slots. The time interval between slots is 0.5ms. The i-th subframe in a radio frame is composed of a (2×i)-th slot and a (2×i+1)-th slot. That is, ten subframes are defined in each radio frame.

Subframes include downlink subframes, uplink subframes, special subframes, sidelink subframes, and the like.

A downlink subframe is a subframe reserved for downlink transmission. An uplink subframe is a subframe reserved for uplink transmission. The special subframe consists of three fields. The three fields include DwPTS (Downlink Pilot Time Slot), GP (Guard Period), and UpPTS (Uplink Pilot Time Slot). The total length of DwPTS, GP, and UpPTS is 1 ms. DwPTS is a field reserved for downlink transmission. UpPTS is a field reserved for uplink transmission. GP is a field in which downlink and uplink transmissions are not performed. Note that the special subframe may be configured only by DwPTS and GP, or may be configured only by GP and UpPTS. A special subframe is arranged between a downlink subframe and an uplink subframe in TDD, and is used for switching from a downlink subframe to an uplink subframe. A sidelink subframe is a subframe reserved or set for sidelink communication. Sidelinks are used for proximity direct communication and proximity direct detection between terminal devices.

A single radio frame is composed of a downlink subframe, an uplink subframe, a special subframe, and/or a sidelink subframe. Further, a single radio frame may be composed of only a downlink subframe, an uplink subframe, a special subframe, or a sidelink subframe.

Multiple radio frame configurations are supported. The radio frame configuration is defined by frame configuration type. Frame configuration type 1 is applicable only to FDD. Frame configuration type 2 is applicable only to TDD. Frame configuration type 3 is applicable only to the operation of a LAA (Licensed Assisted Access) secondary cell.

In frame configuration type 2, multiple uplink-downlink configurations are defined. In the uplink-downlink configuration, each of the 10 subframes in one radio frame corresponds to one of a downlink subframe, an uplink subframe, and a special subframe. Subframe 0, subframe 5 and DwPTS are always reserved for downlink transmission. The subframe immediately after the UpPTS and its special subframe is always reserved for uplink transmission.

In frame structure type 3, ten subframes within one radio frame are reserved for downlink transmission. The terminal device 2 can treat subframes in which no PDSCH or detection signal is transmitted as empty subframes. The terminal device 2 assumes that unless a given signal, channel and/or downlink transmission is detected in a subframe, no signal and/or channel is present in that subframe. Downlink transmission is dedicated to one or more consecutive subframes. The first subframe of the downlink transmission may start anywhere within the subframe. The last subframe of the downlink transmission may be either completely dedicated or dedicated for a time interval defined by the DwPTS.

Note that in frame configuration type 3, 10 subframes within one radio frame may be reserved for uplink transmission. Furthermore, each of the 10 subframes within one radio frame may correspond to any one of a downlink subframe, an uplink subframe, a special subframe, and a sidelink subframe.

The base station device 1 may transmit a downlink physical channel and a downlink physical signal in the DwPTS of the special subframe. The base station device 1 can limit PBCH transmission in the DwPTS of the special subframe. The terminal device 2 may transmit an uplink physical channel and an uplink physical signal in the UpPTS of the special subframe. The terminal device 2 can restrict transmission of some uplink physical channels and uplink physical signals in the UpPTS of the special subframe.

Note that the time interval for one transmission is called TTI (Transmission Time Interval), and in LTE, 1 ms (1 subframe) is defined as 1 TTI.

<LTE frame configuration in this embodiment>
FIG. 3 is a diagram illustrating an example of an LTE downlink subframe in this embodiment. The diagram shown in FIG. 3 is also referred to as an LTE downlink resource grid. The base station device 1 can transmit an LTE downlink physical channel and/or an LTE downlink physical signal in a downlink subframe to the terminal device 2. The terminal device 2 can receive an LTE downlink physical channel and/or an LTE downlink physical signal in a downlink subframe from the base station device 1.

FIG. 4 is a diagram illustrating an example of an LTE uplink subframe in this embodiment. The diagram shown in FIG. 4 is also referred to as an LTE uplink resource grid. The terminal device 2 can transmit an LTE uplink physical channel and/or an LTE uplink physical signal in an uplink subframe to the base station device 1. The base station device 1 can receive an LTE uplink physical channel and/or an LTE uplink physical signal in an uplink subframe from the terminal device 2.

In this embodiment, LTE physical resources may be defined as follows. One slot is defined by multiple symbols. The physical signal or physical channel transmitted in each of the slots is represented by a resource grid. In the downlink, a resource grid is defined by multiple subcarriers in the frequency direction and multiple OFDM symbols in the time direction. In the uplink, a resource grid is defined by multiple subcarriers in the frequency direction and multiple SC-FDMA symbols in the time direction. The number of subcarriers or resource blocks may depend on the bandwidth of the cell. The number of symbols in one slot is determined by the type of CP (Cyclic Prefix). The type of CP is normal CP or extended CP. In normal CP, the number of OFDM symbols or SC-FDMA symbols constituting one slot is seven. In the extended CP, the number of OFDM symbols or SC-FDMA symbols constituting one slot is six. Each of the elements within the resource grid is referred to as a resource element. A resource element is identified using a subcarrier index (number) and a symbol index (number). Note that in the description of this embodiment, the OFDM symbol or SC-FDMA symbol is also simply referred to as a symbol.

A resource block is used to map a certain physical channel (such as PDSCH or PUSCH) to a resource element. Resource blocks include virtual resource blocks and physical resource blocks. A certain physical channel is mapped to a virtual resource block. Virtual resource blocks are mapped to physical resource blocks. One physical resource block is defined by a predetermined number of consecutive symbols in the time domain. One physical resource block is defined from a predetermined number of consecutive subcarriers in the frequency domain. The number of symbols and subcarriers in one physical resource block are determined based on the type of CP in the cell, the subcarrier spacing, and/or parameters set by higher layers. For example, when the CP type is normal CP and the subcarrier interval is 15 kHz, the number of symbols in one physical resource block is 7 and the number of subcarriers is 12. In that case, one physical resource block is composed of (7×12) resource elements. Physical resource blocks are numbered starting from 0 in the frequency domain. Furthermore, two resource blocks within one subframe that correspond to the same physical resource block number are defined as a physical resource block pair (PRB pair, RB pair).

In each LTE cell, one predetermined parameter is used in a certain subframe. For example, the predetermined parameter is a parameter (physical parameter) related to a transmission signal. Parameters related to transmission signals include CP length, subcarrier interval, number of symbols in one subframe (predetermined time length), number of subcarriers in one resource block (predetermined frequency band), multiple access method, and signal Including waveforms, etc.

That is, in an LTE cell, a downlink signal and an uplink signal are each generated using one predetermined parameter in a predetermined time length (for example, a subframe). In other words, the terminal device 2 generates the downlink signal transmitted from the base station device 1 and the uplink signal transmitted to the base station device 1 using one predetermined parameter for each predetermined time length. , it is assumed that. The base station device 1 also generates a downlink signal to be transmitted to the terminal device 2 and an uplink signal to be transmitted from the terminal device 2 using one predetermined parameter for each predetermined time length. Set.

<NR frame configuration in this embodiment>
In each NR cell, one or more predetermined parameters are used for a predetermined length of time (eg, subframe, slot, minislot, symbol, radio frame). That is, in the NR cell, a downlink signal and an uplink signal are each generated using one or more predetermined parameters in a predetermined time length. In other words, the terminal device 2 generates the downlink signal transmitted from the base station device 1 and the uplink signal transmitted to the base station device 1 using one or more predetermined parameters for each predetermined time length. It is assumed that Furthermore, the base station device 1 generates a downlink signal to be transmitted to the terminal device 2 and an uplink signal to be transmitted from the terminal device 2 using one or more predetermined parameters for each predetermined time length. It can be set as follows. When a plurality of predetermined parameters are used, signals generated using those predetermined parameters are multiplexed by a predetermined method. For example, the predetermined method includes FDM (Frequency Division Multiplexing), TDM (Time Division Multiplexing), CDM (Code Division Multiplexing), and/or SDM (Spatial Division Multiplexing).

A plurality of combinations of predetermined parameters set in the NR cell can be defined in advance as a parameter set.

FIG. 5 is a diagram illustrating an example of a parameter set regarding a transmission signal in an NR cell. In the example of FIG. 5, the parameters related to the transmission signal included in the parameter set are the subcarrier interval, the number of subcarriers per resource block in the NR cell, the number of symbols per subframe, and the CP length type. The CP length type is a CP length type used in the NR cell. For example, CP length type 1 corresponds to normal CP in LTE, and CP length type 2 corresponds to extended CP in LTE.

Parameter sets regarding transmission signals in the NR cell can be defined separately for the downlink and uplink. Further, parameter sets related to transmission signals in the NR cell can be set independently for downlink and uplink.

FIG. 6 is a diagram illustrating an example of an NR downlink subframe in this embodiment. In the example of FIG. 6, signals generated using parameter set 1, parameter set 0, and parameter set 2 are subjected to FDM in the cell (system bandwidth). The diagram shown in FIG. 6 is also referred to as an NR downlink resource grid. The base station device 1 can transmit an NR downlink physical channel and/or an NR downlink physical signal in a downlink subframe to the terminal device 2. The terminal device 2 can receive the NR downlink physical channel and/or the NR downlink physical signal in the downlink subframe from the base station device 1 .

FIG. 7 is a diagram showing an example of an NR uplink subframe in this embodiment. In the example of FIG. 7, signals generated using parameter set 1, parameter set 0, and parameter set 2 are subjected to FDM in the cell (system bandwidth). The diagram shown in FIG. 6 is also called an NR uplink resource grid. The base station device 1 can transmit an NR uplink physical channel and/or an NR uplink physical signal in an uplink subframe to the terminal device 2. The terminal device 2 can receive an NR uplink physical channel and/or an NR uplink physical signal in an uplink subframe from the base station device 1.

Furthermore, in NR, subframes, slots, and minislots are defined as units in the time direction.

A subframe is 1 ms and consists of 14 symbols at a predetermined subcarrier interval (for example, 15 kHz). Note that a subframe may be defined by a predetermined number of symbols, and in that case, the subframe length is variable depending on the subcarrier interval.

A slot can be defined as a processing unit in the time direction to which data and the like are allocated. A slot is composed of a predetermined number of symbols and is set unique to a base station, cell, and/or terminal. For example, a slot is 7 or 14 symbols.

Like a slot, a minislot can be defined as a processing unit in the time direction to which data and the like are allocated. However, a mini-slot is made up of fewer symbols than the number of symbols making up the slot. Further, the possible values of the number of symbols constituting a minislot may be changed depending on the carrier frequency. If the carrier frequency is above a predetermined carrier frequency (e.g. 6 GHz), the minimum number of symbols constituting a mini-slot is 1; if the carrier frequency is less than a predetermined carrier frequency (e.g. 6 GHz), the minimum number of symbols constituting a mini-slot is 1. The value is 2. Note that the mini-slot may be used as a part of the slot.

<Antenna port in this embodiment>
Antenna ports are defined so that the propagation channel carrying one symbol can be inferred from the propagation channel carrying another symbol at the same antenna port. For example, different physical resources at the same antenna port can be assumed to be transmitted on the same propagation channel. That is, a symbol at a certain antenna port can be demodulated by estimating a propagation channel using a reference signal at that antenna port. There is also one resource grid for each antenna port. An antenna port is defined by a reference signal. Additionally, each reference signal can define multiple antenna ports.

An antenna port is identified or identified by an antenna port number. For example, antenna ports 0-3 are antenna ports through which CRS is transmitted. That is, PDSCHs transmitted through antenna ports 0 to 3 can be demodulated with CRSs corresponding to antenna ports 0 to 3.

If two antenna ports satisfy a predetermined condition, they can be expressed as quasi co-location (QCL). The predetermined condition is that the global characteristics of the propagation channel carrying symbols at one antenna port can be inferred from the propagation channel carrying symbols at another antenna port. Global characteristics include delay dispersion, Doppler spread, Doppler shift, average gain and/or average delay.

In this embodiment, the antenna port number may be defined differently for each RAT, or may be commonly defined between RATs. For example, antenna ports 0 to 3 in LTE are antenna ports through which CRS is transmitted. In NR, antenna ports 0 to 3 can be antenna ports through which CRS similar to LTE is transmitted. Further, in NR, the antenna port through which CRS similar to LTE is transmitted can have a different antenna port number from antenna ports 0 to 3. In the description of this embodiment, the predetermined antenna port number is applicable for LTE and/or NR.

<Physical channel and physical signal in this embodiment>
In this embodiment, physical channels and physical signals are used.
Physical channels include downlink physical channels, uplink physical channels, and sidelink physical channels. The physical signals include a downlink physical signal, an uplink physical signal, and a sidelink physical signal.

A physical channel and a physical signal in LTE are also referred to as an LTE physical channel and an LTE physical signal, respectively. The physical channel and physical signal in NR are also called NR physical channel and NR physical signal, respectively. The LTE physical channel and the NR physical channel can be defined as different physical channels. The LTE physical signal and the NR physical signal can be defined as different physical signals. In the description of this embodiment, the LTE physical channel and the NR physical channel are also simply referred to as physical channels, and the LTE physical signal and NR physical signal are also simply referred to as physical signals. That is, the description of the physical channel can be applied to both the LTE physical channel and the NR physical channel. The description of the physical signal can be applied to both the LTE physical signal and the NR physical signal.

<NR physical channel and NR physical signal in this embodiment>
The description of physical channels and physical signals in LTE can also be applied to NR physical channels and NR physical signals, respectively. The NR physical channel and NR physical signal are referred to as follows.

NR downlink physical channels include NR-PBCH, NR-PCFICH, NR-PHICH, NR-PDCCH, NR-EPDCCH, NR-MPDCCH, NR-R-PDCCH, NR-PDSCH, NR-PMCH, and the like.

The NR downlink physical signal includes NR-SS, NR-DL-RS, NR-DS, and the like. NR-SS includes NR-PSS, NR-SSS, and the like. NR-RS includes NR-CRS, NR-PDSCH-DMRS, NR-EPDCCH-DMRS, NR-PRS, NR-CSI-RS, NR-TRS, and the like.

NR uplink physical channels include NR-PUSCH, NR-PUCCH, NR-PRACH, and the like.

The NR uplink physical signal includes NR-UL-RS. NR-UL-RS includes NR-UL-DMRS, NR-SRS, and the like.

NR sidelink physical channels include NR-PSBCH, NR-PSCCH, NR-PSDCH, NR-PSSCH, etc.

<Downlink physical channel in this embodiment>
The PBCH is used to broadcast MIB (Master Information Block), which is broadcast information specific to the serving cell of the base station device 1 . PBCH is transmitted only in subframe 0 within a radio frame. The MIB can be updated at 40ms intervals. PBCH is repeatedly transmitted in a 10ms period. Specifically, the initial transmission of the MIB is performed in subframe 0 of a radio frame that satisfies the condition that the remainder when SFN (System Frame Number) is divided by 4 is 0, and the MIB is initially transmitted in subframe 0 of all other radio frames. Repetition of the MIB is performed. SFN is a radio frame number (system frame number). MIB is system information. For example, the MIB includes information indicating SFN.

PCFICH is used to transmit information regarding the number of OFDM symbols used for PDCCH transmission. The area indicated by PCFICH is also called the PDCCH area. The information transmitted on the PCFICH is also called CFI (Control Format Indicator).

PHICH transmits HARQ-ACK (HARQ indicator, HARQ feedback, response information) indicating ACK (ACKnowledgement) or NACK (Negative ACKnowledgement) for uplink data (Uplink Shared Channel: UL-SCH) received by base station device 1 used for For example, when the terminal device 2 receives HARQ-ACK indicating ACK, it does not retransmit the corresponding uplink data. For example, when the terminal device 2 receives HARQ-ACK indicating NACK, the terminal device 2 retransmits the corresponding uplink data in a predetermined uplink subframe. A certain PHICH transmits HARQ-ACK for certain uplink data. The base station device 1 transmits each HARQ-ACK for a plurality of uplink data included in the same PUSCH using a plurality of PHICHs.

PDCCH and EPDCCH are used to transmit downlink control information (DCI). The mapping of information bits of downlink control information is defined as a DCI format. The downlink control information includes a downlink grant and an uplink grant. A downlink grant is also referred to as a downlink assignment or a downlink allocation.

PDCCH is transmitted by a set of one or more consecutive CCEs (Control Channel Elements). The CCE is composed of nine REGs (Resource Element Groups). REG is composed of four resource elements. When a PDCCH is composed of n consecutive CCEs, the PDCCH starts with a CCE that satisfies the condition that the remainder when dividing i, which is the index (number) of the CCE, by n is 0.

EPDCCH is transmitted by a set of one or more consecutive ECCEs (Enhanced Control Channel Elements). ECCE is composed of a plurality of EREGs (Enhanced Resource Element Groups).

The downlink grant is used for scheduling PDSCH within a certain cell. The downlink grant is used for scheduling the PDSCH within the same subframe as the subframe in which the downlink grant was transmitted. The uplink grant is used for scheduling PUSCH within a certain cell. The uplink grant is used for scheduling a single PUSCH in a subframe that is four or more subframes after the subframe in which the uplink grant was transmitted.

A CRC (Cyclic Redundancy Check) parity bit is added to the DCI. The CRC parity bits are scrambled with an RNTI (Radio Network Temporary Identifier). The RNTI is an identifier that can be defined or set depending on the purpose of the DCI. The RNTI is an identifier predefined in the specifications, an identifier set as information unique to a cell, an identifier set as information unique to the terminal device 2, or an identifier set as information unique to a group belonging to the terminal device 2. This is an identifier. For example, in monitoring the PDCCH or EPDCCH, the terminal device 2 descrambles the CRC parity bit added to the DCI with a predetermined RNTI, and identifies whether the CRC is correct. If the CRC is correct, it is known that the DCI is the DCI for terminal device 2.

PDSCH is used to transmit downlink data (Downlink Shared Channel: DL-SCH). The PDSCH is also used to transmit upper layer control information.

PMCH is used to transmit multicast data (Multicast Channel: MCH).

In the PDCCH region, multiple PDCCHs may be frequency-, time-, and/or spatially multiplexed. In the EPDCCH region, multiple EPDCCHs may be multiplexed in frequency, time, and/or space. In the PDSCH region, multiple PDSCHs may be frequency-, time-, and/or spatially-multiplexed. PDCCH, PDSCH and/or EPDCCH may be frequency, time and/or spatially multiplexed.

<Downlink physical signal in this embodiment>
The synchronization signal is used by the terminal device 2 to synchronize the downlink frequency domain and/or time domain. The synchronization signal includes a PSS (Primary Synchronization Signal) and an SSS (Secondary Synchronization Signal). A synchronization signal is placed in a predetermined subframe within a radio frame. For example, in the TDD system, synchronization signals are placed in subframes 0, 1, 5, and 6 within a radio frame. In the FDD system, synchronization signals are placed in subframes 0 and 5 within a radio frame.

PSS may be used for coarse frame/symbol timing synchronization (time domain synchronization) and cell identity group identification. SSS may be used for more accurate frame timing synchronization, cell identification, and CP length detection. That is, by using PSS and SSS, frame timing synchronization and cell identification can be performed.

The downlink reference signal is used by the terminal device 2 to estimate the propagation path of the downlink physical channel, correct the propagation path, calculate downlink CSI (Channel State Information), and/or measure the positioning of the terminal device 2. It is used to carry out.

CRS is transmitted in the entire subframe band. CRS is used to receive (demodulate) PBCH, PDCCH, PHICH, PCFICH, and PDSCH. The CRS may be used by the terminal device 2 to calculate downlink channel state information. PBCH, PDCCH, PHICH, and PCFICH are transmitted on antenna ports used for CRS transmission. CRS supports configurations of 1, 2 or 4 antenna ports. CRS is transmitted on one or more of antenna ports 0-3.

A URS associated with a PDSCH is transmitted in the subframe and band used for transmission of the PDSCH to which the URS is associated. The URS is used to demodulate the PDSCH to which it is associated. The URS associated with the PDSCH is transmitted on one or more of the antenna ports 5, 7-14.

The PDSCH is transmitted on the antenna port used for CRS or URS transmission, based on the transmission mode and DCI format. DCI format 1A is used for scheduling PDSCH transmitted by an antenna port used for CRS transmission. DCI format 2D is used for scheduling PDSCH transmitted on antenna ports used for URS transmission.

The DMRS associated with the EPDCCH is transmitted in the subframe and band used for the transmission of the EPDCCH to which the DMRS is associated. DMRS is used to demodulate the EPDCCH to which it is associated. EPDCCH is transmitted on an antenna port used for DMRS transmission. DMRS associated with EPDCCH is transmitted on one or more of antenna ports 107-114.

CSI-RS is transmitted in configured subframes. The base station device 1 sets the resources on which the CSI-RS is transmitted. The CSI-RS is used by the terminal device 2 to calculate downlink channel state information. The terminal device 2 performs signal measurement (channel measurement) using the CSI-RS. The CSI-RS supports configuration of some or all of 1, 2, 4, 8, 12, 16, 24, and 32 antenna ports. CSI-RS is transmitted on one or more of antenna ports 15-46. Note that the supported antenna ports may be determined based on the terminal device capabilities of the terminal device 2, RRC parameter settings, and/or the set transmission mode.

ZP CSI-RS resources are configured by upper layers. The ZP CSI-RS resources may be transmitted with zero output power. That is, there is no need to transmit any ZP CSI-RS resources. PDSCH and EPDCCH are not transmitted in the resources set by ZP CSI-RS. For example, ZP CSI-RS resources are used by neighboring cells to transmit NZP CSI-RS. Further, for example, the ZP CSI-RS resource is used to measure the CSI-IM. Further, for example, the ZP CSI-RS resource is a resource on which a predetermined channel such as PDSCH is not transmitted. In other words, a given channel is mapped (with rate matching and puncturing) excluding the resources of the ZP CSI-RS.

<Uplink physical channel in this embodiment>
PUCCH is a physical channel used to transmit uplink control information (UCI). The uplink control information includes downlink channel state information (CSI), scheduling request (SR) indicating a request for PUSCH resources, and downlink data (Transport block: TB, Downlink-Shared Channel: DL). -SCH). HARQ-ACK is also referred to as ACK/NACK, HARQ feedback, or response information. Furthermore, HARQ-ACK for downlink data indicates ACK, NACK, or DTX.

PUSCH is a physical channel used to transmit uplink data (Uplink-Shared Channel: UL-SCH). PUSCH may also be used to transmit HARQ-ACK and/or channel state information along with uplink data. Additionally, PUSCH may be used to transmit only channel state information or only HARQ-ACK and channel state information.

PRACH is a physical channel used to transmit random access preambles. PRACH can be used for the terminal device 2 to synchronize with the base station device 1 in the time domain. PRACH also includes initial connection establishment procedures (processing), handover procedures, connection re-establishment procedures, synchronization (timing adjustment) for uplink transmission, and/or requests for PUSCH resources. It is also used to indicate.

In the PUCCH region, multiple PUCCHs are frequency, time, space and/or code multiplexed. In the PUSCH region, multiple PUSCHs may be frequency-, time-, space-, and/or code-multiplexed. PUCCH and PUSCH may be frequency, time, space and/or code multiplexed. PRACH may be arranged over a single subframe or two subframes. A plurality of PRACHs may be code multiplexed.

<Configuration example of base station device 1 in this embodiment>
FIG. 8 is a schematic block diagram showing the configuration of the base station device 1 of this embodiment. As illustrated, the base station device 1 includes an upper layer processing section 101, a control section 103, a receiving section 105, a transmitting section 107, and a transmitting/receiving antenna 109. Further, the receiving section 105 includes a decoding section 1051, a demodulating section 1053, a demultiplexing section 1055, a radio receiving section 1057, and a channel measuring section 1059. Further, the transmitting section 107 includes an encoding section 1071, a modulating section 1073, a multiplexing section 1075, a wireless transmitting section 1077, and a downlink reference signal generating section 1079.

As already explained, the base station device 1 can support one or more RATs. Some or all of the units included in the base station device 1 shown in FIG. 8 may be configured individually depending on the RAT. For example, the receiving section 105 and the transmitting section 107 are configured separately for LTE and NR. Further, in the NR cell, some or all of the units included in the base station device 1 shown in FIG. 8 can be individually configured according to a parameter set regarding the transmission signal. For example, in a certain NR cell, the radio receiving section 1057 and the radio transmitting section 1077 can be individually configured according to a parameter set regarding the transmission signal.

The upper layer processing unit 101 processes a Medium Access Control (MAC) layer, a Packet Data Convergence Protocol (PDCP) layer, a Radio Link Control (RLC) layer, a Radio Resource Control (Radio Resource Control) layer, and a Radio Link Control (RLC) layer. Processes the Resource Control (RRC) layer. Further, upper layer processing section 101 generates control information to control receiving section 105 and transmitting section 107 and outputs it to control section 103 .

Control section 103 controls receiving section 105 and transmitting section 107 based on control information from upper layer processing section 101 . The control unit 103 generates control information for the upper layer processing unit 101 and outputs it to the upper layer processing unit 101. Control section 103 receives the decoded signal from decoding section 1051 and the channel estimation result from channel measurement section 1059. Control section 103 outputs a signal to be encoded to encoding section 1071. Further, the control unit 103 is used to control all or part of the base station device 1.

The upper layer processing unit 101 performs processing and management regarding RAT control, radio resource control, subframe configuration, scheduling control, and/or CSI reporting control. Processing and management in the upper layer processing unit 101 are performed for each terminal device or in common for all terminal devices connected to the base station device. The processing and management in the upper layer processing unit 101 may be performed only by the upper layer processing unit 101, or may be obtained from an upper node or another base station device. Further, the processing and management in the upper layer processing unit 101 may be performed individually depending on the RAT. For example, the upper layer processing unit 101 separately performs processing and management in LTE and processing and management in NR.

In the RAT control in the upper layer processing unit 101, management regarding the RAT is performed. For example, in RAT control, management regarding LTE and/or management regarding NR is performed. Management regarding NR includes setting and processing of parameter sets regarding transmission signals in NR cells.

Radio resource control in the upper layer processing unit 101 involves generation and/or management of downlink data (transport blocks), system information, RRC messages (RRC parameters), and/or MAC control elements (CEs). It will be done.

The subframe settings in the upper layer processing unit 101 manage subframe settings, subframe pattern settings, uplink-downlink settings, uplink reference UL-DL settings, and/or downlink reference UL-DL settings. be exposed. Note that the subframe settings in the upper layer processing section 101 are also called base station subframe settings. Furthermore, the subframe settings in the upper layer processing section 101 can be determined based on the uplink traffic amount and the downlink traffic amount. Furthermore, the subframe settings in the upper layer processing section 101 can be determined based on the scheduling result of the scheduling control in the upper layer processing section 101.

Scheduling control in upper layer processing section 101 determines the frequency and subframe to which a physical channel is allocated, and the frequency and subframe of the physical channel, based on the received channel state information and the estimated propagation path value and channel quality input from channel measurement section 1059. The coding rate, modulation method, transmission power, etc. are determined. For example, the control unit 103 generates control information (DCI format) based on the scheduling result of the scheduling control in the upper layer processing unit 101.

In the CSI reporting control in the upper layer processing unit 101, CSI reporting of the terminal device 2 is controlled. For example, settings regarding CSI reference resources assumed for calculating CSI in the terminal device 2 are controlled.

The receiving unit 105 receives the signal transmitted from the terminal device 2 via the transmitting/receiving antenna 109 under the control of the control unit 103, further performs receiving processing such as separation, demodulation, and decoding, and transmits the received information. It is output to the control unit 103. Note that the reception processing in the receiving unit 105 is performed based on predefined settings or settings notified to the terminal device 2 by the base station device 1.

The radio receiving unit 1057 converts the uplink signal received via the transmitting/receiving antenna 109 to an intermediate frequency (down converting), removes unnecessary frequency components, and maintains the signal level appropriately. control of the amplification level, quadrature demodulation based on the in-phase and quadrature components of the received signal, conversion of analog signals to digital signals, removal of Guard Intervals (GI), and/or fast Fourier transform. Extracts frequency domain signals using Transform: FFT).

The demultiplexer 1055 separates an uplink channel such as PUCCH or PUSCH and/or an uplink reference signal from the signal input from the radio receiver 1057. Demultiplexing section 1055 outputs the uplink reference signal to channel measurement section 1059. The demultiplexer 1055 performs propagation path compensation for the uplink channel based on the propagation path estimate input from the channel measurement section 1059.

The demodulation section 1053 modulates the received signal using a modulation method such as BPSK (Binary Phase Shift Keying), QPSK (Quadrature Phase Shift Keying), 16QAM (Quadrature Amplitude Modulation), 64QAM, or 256QAM for the modulation symbol of the uplink channel. demodulates. Demodulation section 1053 performs separation and demodulation of MIMO-multiplexed uplink channels.

The decoding unit 1051 performs decoding processing on the coded bits of the demodulated uplink channel. The decoded uplink data and/or uplink control information is output to control section 103. The decoding unit 1051 performs decoding processing for each transport block for PUSCH.

Channel measuring section 1059 measures the propagation path estimate and/or channel quality from the uplink reference signal input from demultiplexing section 1055 and outputs it to demultiplexing section 1055 and/or control section 103 . For example, the channel measurement unit 1059 uses UL-DMRS to measure the estimated value of the propagation path for performing propagation path compensation for PUCCH or PUSCH, and measures the quality of the channel in the uplink using SRS.

Transmitting section 107 performs transmission processing such as encoding, modulation, and multiplexing on downlink control information and downlink data input from upper layer processing section 101 under control from control section 103 . For example, transmitting section 107 generates and multiplexes PHICH, PDCCH, EPDCCH, PDSCH, and downlink reference signals, and generates a transmission signal. Note that the transmission process in the transmitter 107 is based on predefined settings, settings notified by the base station device 1 to the terminal device 2, or settings notified through the PDCCH or EPDCCH transmitted in the same subframe. It will be done.

The encoding unit 1071 performs predetermined encoding such as block encoding, convolutional encoding, turbo encoding, etc. on the HARQ indicator (HARQ-ACK), downlink control information, and downlink data input from the control unit 103. Encoding is performed using the method. Modulating section 1073 modulates the encoded bits input from encoding section 1071 using a predetermined modulation method such as BPSK, QPSK, 16QAM, 64QAM, or 256QAM. The downlink reference signal generation section 1079 generates a downlink reference signal based on a physical cell identification (PCI), RRC parameters set in the terminal device 2, and the like. Multiplexing section 1075 multiplexes the modulation symbol of each channel and the downlink reference signal, and arranges it in a predetermined resource element.

The wireless transmitter 1077 converts the signal from the multiplexer 1075 into a time domain signal by inverse fast Fourier transform (IFFT), adds a guard interval, generates a baseband digital signal, Performs processing such as conversion to analog signals, quadrature modulation, conversion from intermediate frequency signals to high frequency signals (up convert), removal of excess frequency components, and power amplification to generate transmission signals. . The transmission signal output by the wireless transmitter 1077 is transmitted from the transmitting/receiving antenna 109.

<Configuration example of terminal device 2 in this embodiment>
FIG. 9 is a schematic block diagram showing the configuration of the terminal device 2 of this embodiment. As illustrated, the terminal device 2 includes an upper layer processing section 201, a control section 203, a receiving section 205, a transmitting section 207, and a transmitting/receiving antenna 209. Further, the receiving section 205 includes a decoding section 2051, a demodulating section 2053, a demultiplexing section 2055, a radio receiving section 2057, and a channel measuring section 2059. Further, the transmitter 207 includes an encoder 2071, a modulator 2073, a multiplexer 2075, a wireless transmitter 2077, and an uplink reference signal generator 2079.

As already explained, the terminal device 2 can support one or more RATs. Some or all of the units included in the terminal device 2 shown in FIG. 9 may be configured individually depending on the RAT. For example, the receiving section 205 and the transmitting section 207 are configured separately for LTE and NR. Further, in the NR cell, some or all of the units included in the terminal device 2 shown in FIG. 9 can be individually configured according to a parameter set regarding the transmission signal. For example, in a certain NR cell, the radio receiving section 2057 and the radio transmitting section 2077 can be individually configured according to a parameter set regarding the transmission signal.

Upper layer processing section 201 outputs uplink data (transport block) to control section 203. The upper layer processing unit 201 processes a medium access control (MAC) layer, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, and a radio resource control (Radio resource control) layer. Performs Resource Control (RRC) layer processing. Further, upper layer processing section 201 generates control information to control receiving section 205 and transmitting section 207 and outputs it to control section 203 .

The control unit 203 controls the receiving unit 205 and the transmitting unit 207 based on control information from the upper layer processing unit 201. The control unit 203 generates control information for the upper layer processing unit 201 and outputs it to the upper layer processing unit 201. Control section 203 receives the decoded signal from decoding section 2051 and the channel estimation result from channel measurement section 2059. Control section 203 outputs a signal to be encoded to encoding section 2071. Further, the control unit 203 may be used to control all or part of the terminal device 2.

The upper layer processing unit 201 performs processing and management regarding RAT control, radio resource control, subframe configuration, scheduling control, and/or CSI reporting control. Processing and management in the upper layer processing unit 201 are performed based on predefined settings and/or settings based on control information set or notified from the base station device 1. For example, the control information from the base station device 1 includes RRC parameters, MAC control elements, or DCI. Furthermore, the processing and management in the upper layer processing unit 201 may be performed individually depending on the RAT. For example, the upper layer processing unit 201 separately performs processing and management in LTE and processing and management in NR.

In the RAT control in the upper layer processing unit 201, management regarding the RAT is performed. For example, in RAT control, management regarding LTE and/or management regarding NR is performed. Management regarding NR includes setting and processing of parameter sets regarding transmission signals in NR cells.

In the radio resource control in the upper layer processing unit 201, configuration information in the own device is managed. Radio resource control in the upper layer processing unit 201 involves the generation and/or management of uplink data (transport blocks), system information, RRC messages (RRC parameters), and/or MAC control elements (CEs). It will be done.

In the subframe settings in the upper layer processing unit 201, subframe settings in the base station device 1 and/or a base station device different from the base station device 1 are managed. The subframe settings include uplink or downlink settings for the subframe, subframe pattern settings, uplink-downlink settings, uplink reference UL-DL settings, and/or downlink reference UL-DL settings. Note that the subframe settings in the upper layer processing section 201 are also referred to as terminal subframe settings.

In the scheduling control in the upper layer processing section 201, control information for controlling the scheduling of the receiving section 205 and the transmitting section 207 is generated based on DCI (scheduling information) from the base station device 1.

In the CSI reporting control in the upper layer processing unit 201, control regarding reporting of CSI to the base station device 1 is performed. For example, in CSI reporting control, settings regarding CSI reference resources assumed for calculating CSI in channel measurement section 2059 are controlled. CSI reporting control controls resources (timing) used to report CSI based on DCI and/or RRC parameters.

The receiving unit 205 receives the signal transmitted from the base station device 1 via the transmitting/receiving antenna 209 under the control of the control unit 203, further performs receiving processing such as separation, demodulation, and decoding, and receives the received information. is output to the control unit 203. Note that the reception processing in the receiving unit 205 is performed based on predefined settings or notifications or settings from the base station device 1.

The radio receiving unit 2057 converts the uplink signal received via the transmitting/receiving antenna 209 to an intermediate frequency (down converting), removes unnecessary frequency components, and maintains the signal level appropriately. control of the amplification level, quadrature demodulation based on the in-phase and quadrature components of the received signal, conversion of analog signals to digital signals, removal of Guard Intervals (GI), and/or fast Fourier transform. Extracts frequency domain signals using Transform: FFT).

The demultiplexer 2055 separates a downlink channel such as PHICH, PDCCH, EPDCCH, or PDSCH, a downlink synchronization signal, and/or a downlink reference signal from the signal input from the radio reception section 2057. Demultiplexing section 2055 outputs the downlink reference signal to channel measurement section 2059. The demultiplexer 2055 performs propagation path compensation for the downlink channel from the estimated propagation path value input from the channel measurement section 2059.

The demodulation section 2053 demodulates the received signal using a modulation scheme such as BPSK, QPSK, 16QAM, 64QAM, or 256QAM on the modulation symbol of the downlink channel. Demodulation section 2053 performs separation and demodulation of MIMO multiplexed downlink channels.

The decoding unit 2051 performs decoding processing on the coded bits of the demodulated downlink channel. The decoded downlink data and/or downlink control information is output to the control section 203. The decoding unit 2051 performs decoding processing for each transport block on the PDSCH.

Channel measuring section 2059 measures a propagation path estimate and/or channel quality from the downlink reference signal input from demultiplexing section 2055 and outputs it to demultiplexing section 2055 and/or control section 203 . The downlink reference signal used for measurement by channel measurement section 2059 may be determined based on at least the transmission mode set by RRC parameters and/or other RRC parameters. For example, DL-DMRS measures an estimated value of a propagation path for performing propagation path compensation for PDSCH or EPDCCH. CRS measures a propagation path estimate for performing propagation path compensation for PDCCH or PDSCH, and/or a downlink channel for reporting CSI. CSI-RS measures a channel in the downlink for reporting CSI. Channel measurement section 2059 calculates RSRP (Reference Signal Received Power) and/or RSRQ (Reference Signal Received Quality) based on the CRS, CSI-RS, or detection signal, and outputs it to upper layer processing section 201.

Transmitting section 207 performs transmission processing such as encoding, modulation, and multiplexing on uplink control information and uplink data input from upper layer processing section 201 under control from control section 203 . For example, the transmitter 207 generates and multiplexes uplink channels such as PUSCH or PUCCH and/or uplink reference signals, and generates transmission signals. Note that the transmission processing in the transmitter 207 is performed based on predefined settings or settings or notifications from the base station device 1.

The encoding unit 2071 performs predetermined encoding such as block encoding, convolutional encoding, turbo encoding, etc. on the HARQ indicator (HARQ-ACK), uplink control information, and uplink data input from the control unit 203. Encoding is performed using the method. Modulating section 2073 modulates the encoded bits input from encoding section 2071 using a predetermined modulation method such as BPSK, QPSK, 16QAM, 64QAM, or 256QAM. The uplink reference signal generation section 2079 generates an uplink reference signal based on the RRC parameters set in the terminal device 2 and the like. Multiplexing section 2075 multiplexes modulation symbols and uplink reference signals for each channel and arranges them in predetermined resource elements.

The wireless transmitter 2077 converts the signal from the multiplexer 2075 into a time domain signal by inverse fast Fourier transform (IFFT), adds a guard interval, generates a baseband digital signal, Performs processing such as conversion to analog signals, quadrature modulation, conversion from intermediate frequency signals to high frequency signals (up convert), removal of excess frequency components, and power amplification to generate transmission signals. . The transmission signal output by the wireless transmitter 2077 is transmitted from the transmitting/receiving antenna 209.

<Signaling of control information in this embodiment>
The base station device 1 and the terminal device 2 can each use various methods for signaling (notification, notification, setting) of control information. Signaling of control information can occur at various layers. Control information signaling includes physical layer signaling that is signaling through a physical layer, RRC signaling that is signaling through an RRC layer, MAC signaling that is signaling through a MAC layer, and the like. RRC signaling is dedicated RRC signaling that notifies the terminal device 2 of specific control information, or common RRC signaling that notifies the base station device 1 of specific control information. . Signaling used by layers higher than the physical layer, such as RRC signaling and MAC signaling, is also called upper layer signaling.

RRC signaling is realized by signaling RRC parameters. MAC signaling is achieved by signaling a MAC control element. Physical layer signaling is realized by signaling downlink control information (DCI) or uplink control information (UCI). Physical layer signaling is also called DCI signaling, UCI signaling, PDCCH signaling or PUCCH signaling. RRC parameters and MAC control elements are transmitted using PDSCH or PUSCH. DCI is transmitted using PDCCH or EPDCCH. UCI is transmitted using PUCCH or PUSCH. RRC signaling and MAC signaling are used to signal semi-static control information and are also called semi-static signaling. Physical layer signaling is used to signal dynamic control information and is also called dynamic signaling. The DCI is used for PDSCH scheduling, PUSCH scheduling, and the like. The UCI is used for CSI reporting, HARQ-ACK reporting, and/or scheduling requests (SR).

<Details of downlink control information in this embodiment>
The DCI is notified using a DCI format with predefined fields. Predetermined information bits are mapped to fields defined in the DCI format. The DCI notifies downlink scheduling information, uplink scheduling information, sidelink scheduling information, a request for aperiodic CSI reporting, or an uplink transmission power command.

The DCI format monitored by the terminal device 2 is determined by the transmission mode set for each serving cell. That is, part of the DCI format monitored by the terminal device 2 can differ depending on the transmission mode. For example, the terminal device 2 set to downlink transmission mode 1 monitors DCI format 1A and DCI format 1. For example, the terminal device 2 set to downlink transmission mode 4 monitors DCI format 1A and DCI format 2. For example, the terminal device 2 configured with uplink transmission mode 1 monitors DCI format 0. For example, the terminal device 2 set to uplink transmission mode 2 monitors DCI format 0 and DCI format 4.

The control region in which the PDCCH for notifying the DCI for the terminal device 2 is arranged is not notified, and the terminal device 2 detects the DCI for the terminal device 2 by blind decoding (blind detection). Specifically, the terminal device 2 monitors a set of PDCCH candidates in the serving cell. Monitoring means attempting decoding with all monitored DCI formats for each PDCCH in the set. For example, the terminal device 2 attempts to decode all aggregation levels, PDCCH candidates, and DCI formats that may be transmitted to the terminal device 2. The terminal device 2 recognizes the DCI (PDCCH) that has been successfully decoded (detected) as the DCI (PDCCH) for the terminal device 2 .

A cyclic redundancy check (CRC) is added to the DCI. CRC is used for DCI error detection and DCI blind detection. The CRC (CRC parity bit) is scrambled by the RNTI (Radio Network Temporary Identifier). The terminal device 2 detects whether it is a DCI for the terminal device 2 based on the RNTI. Specifically, the terminal device 2 descrambles the bits corresponding to the CRC using a predetermined RNTI, extracts the CRC, and detects whether the corresponding DCI is correct.

RNTI is defined or set depending on the purpose and use of DCI. RNTI is C-RNTI (Cell-RNTI), SPS C-RNTI (Semi Persistent Scheduling C-RNTI), SI-RNTI (System Information-RNTI), P-RNTI (Paging-RNTI), RA-RNTI (Random Access -RNTI), TPC-PUCCH-RNTI (Transmit Power Control-PUCCH-RNTI), TPC-PUSCH-RNTI (Transmit Power Control-PUSCH-RNTI), Temporary C-RNTI, M-RNTI (MBMS (Multimedia Broadcast Multicast Services) ) -RNTI), eIMTA-RNTI, and CC-RNTI.

The C-RNTI and SPS C-RNTI are RNTIs unique to the terminal device 2 within the base station device 1 (cell), and are identifiers for identifying the terminal device 2. C-RNTI is used to schedule PDSCH or PUSCH in a certain subframe. SPS C-RNTI is used to activate or release periodic scheduling of resources for PDSCH or PUSCH. A control channel with CRC scrambled with SI-RNTI is used to schedule SIB (System Information Block). A control channel with CRC scrambled with P-RNTI is used to control paging. A control channel with CRC scrambled with RA-RNTI is used to schedule responses to RACH. A control channel with CRC scrambled with TPC-PUCCH-RNTI is used to perform power control of PUCCH. A control channel with CRC scrambled with TPC-PUSCH-RNTI is used to perform power control of PUSCH. A control channel having a CRC scrambled with a Temporary C-RNTI is used by a mobile station device for which the C-RNTI is not set or recognized. A control channel with CRC scrambled with M-RNTI is used to schedule MBMS. The control channel with scrambled CRC in eIMTA-RNTI is used in dynamic TDD (eIMTA) to notify information about the TDD UL/DL configuration of the TDD serving cell. A control channel (DCI) with CRC scrambled with CC-RNTI is used to signal the configuration of dedicated OFDM symbols in LAA secondary cells. Note that the DCI format is not limited to the above-mentioned RNTI, and the DCI format may be scrambled using a new RNTI.

The scheduling information (downlink scheduling information, uplink scheduling information, sidelink scheduling information) includes information for scheduling in units of resource blocks or resource block groups as frequency domain scheduling. A resource block group is a set of consecutive resource blocks and indicates resources allocated to a scheduled terminal device. The size of the resource block group depends on the system bandwidth.

<Details of downlink control channel in this embodiment>
DCI is transmitted using a control channel such as PDCCH or EPDCCH. The terminal device 2 monitors a set of PDCCH candidates and/or a set of EPDCCH candidates of one or more activated serving cells configured by RRC signaling. Here, monitoring means attempting to decode the PDCCH and/or EPDCCH in the set corresponding to all monitored DCI formats.

The set of PDCCH candidates or the set of EPDCCH candidates is also called a search space. A shared search space (CSS) and a terminal-specific search space (USS) are defined as search spaces. CSS may be defined only for search spaces related to PDCCH.

CSS (Common Search Space) is a search space that is set based on parameters specific to the base station device 1 and/or predefined parameters. For example, CSS is a search space commonly used by multiple terminal devices. Therefore, when the base station device 1 maps a control channel common to a plurality of terminal devices to the CSS, resources for transmitting the control channel are reduced.

The USS (UE-specific Search Space) is a search space that is set using at least parameters specific to the terminal device 2. Therefore, the USS is a search space specific to the terminal device 2, and the base station device 1 can individually transmit a control channel specific to the terminal device 2 using the USS. Therefore, the base station device 1 can efficiently map unique control channels to a plurality of terminal devices.

The USS may be configured to be commonly used by multiple terminal devices. Since a common USS is set for a plurality of terminal devices, parameters unique to the terminal device 2 are set to have the same value among the plurality of terminal devices. For example, the unit in which the same parameters are set among a plurality of terminal devices is a cell, a transmission point, or a group of predetermined terminal devices.

The search space for each aggregation level is defined by a set of PDCCH candidates. Each PDCCH is transmitted using a set of one or more CCEs (Control Channel Elements). The number of CCEs used for one PDCCH is also called an aggregation level. For example, the number of CCEs used for one PDCCH is 1, 2, 4, or 8.

The search space for each aggregation level is defined by a set of EPDCCH candidates. Each EPDCCH is transmitted using a set of one or more ECCEs (Enhanced Control Channel Elements). The number of ECCEs used for one EPDCCH is also called an aggregation level. For example, the number of ECCEs used for one EPDCCH is 1, 2, 4, 8, 16, or 32.

The number of PDCCH candidates or the number of EPDCCH candidates is determined based on at least the search space and the aggregation level. For example, in CSS, the number of PDCCH candidates at aggregation levels 4 and 8 is 4 and 2, respectively. For example, in USS, the number of PDCCH candidates in aggregations 1, 2, 4 and 8 are 6, 6, 2 and 2, respectively.

Each ECCE is composed of a plurality of EREGs (Enhanced resource element groups). EREG is used to define mapping for EPDCCH resource elements. In each RB pair, 16 EREGs are defined, numbered 0 to 15. That is, EREG0 to EREG15 are defined in each RB pair. In each RB pair, EREG0 to EREG15 are defined periodically with priority given in the frequency direction to resource elements other than resource elements to which a predetermined signal and/or channel is mapped. For example, resource elements to which demodulation reference signals associated with EPDCCHs transmitted through antenna ports 107 to 110 are mapped are not defined as EREGs.

The number of ECCEs used for one EPDCCH depends on the EPDCCH format and is determined based on other parameters. The number of ECCEs used for one EPDCCH is also called an aggregation level. For example, the number of ECCEs used for one EPDCCH is determined based on the number of resource elements that can be used for EPDCCH transmission in one RB pair, the EPDCCH transmission method, and the like. For example, the number of ECCEs used for one EPDCCH is 1, 2, 4, 8, 16, or 32. Further, the number of EREGs used for one ECCE is determined based on the type of subframe and the type of cyclic prefix, and is 4 or 8. Distributed transmission and localized transmission are supported as EPDCCH transmission methods.

EPDCCH can use distributed or localized transmission. Distributed transmission and localized transmission differ in the mapping of ECCE to EREG and RB pairs. For example, in distributed transmission, one ECCE is configured using EREGs of multiple RB pairs. In local transmission, one ECCE is configured using one RB pair's EREG.

The base station device 1 performs settings regarding the EPDCCH for the terminal device 2. The terminal device 2 monitors multiple EPDCCHs based on the settings from the base station device 1. A set of RB pairs for which the terminal device 2 monitors the EPDCCH can be configured. The set of RB pairs is also called an EPDCCH set or an EPDCCH-PRB set. One or more EPDCCH sets can be configured for one terminal device 2. Each EPDCCH set is composed of one or more RB pairs. Further, settings related to EPDCCH can be performed individually for each EPDCCH set.

The base station device 1 can configure a predetermined number of EPDCCH sets for the terminal device 2. For example, up to two EPDCCH sets can be configured as EPDCCH set 0 and/or EPDCCH set 1. Each EPDCCH set can be configured with a predetermined number of RB pairs. Each EPDCCH set constitutes one set of multiple ECCEs. The number of ECCEs configured in one EPDCCH set is determined based on the number of RB pairs configured as the EPDCCH set and the number of EREGs used in one ECCE. When the number of ECCEs configured in one EPDCCH set is N, each EPDCCH set configures ECCEs numbered from 0 to N-1. For example, when the number of EREGs used for one ECCE is 4, an EPDCCH set composed of 4 RB pairs constitutes 16 ECCEs.

<Details of resource allocation in this embodiment>
The base station device 1 can use a plurality of methods to allocate PDSCH and/or PUSCH resources to the terminal device 2. Methods of resource allocation include dynamic scheduling, semi-persistent scheduling, multi-subframe scheduling, and cross-subframe scheduling.

In dynamic scheduling, one DCI performs resource allocation in one subframe. Specifically, PDCCH or EPDCCH in a certain subframe performs scheduling for PDSCH in that subframe. PDCCH or EPDCCH in a certain subframe performs scheduling for PUSCH in a predetermined subframe after that subframe.

In multi-subframe scheduling, one DCI performs resource allocation in one or more subframes. Specifically, PDCCH or EPDCCH in a certain subframe performs scheduling for PDSCH in one or more subframes after a predetermined number of subframes. PDCCH or EPDCCH in a certain subframe performs scheduling for PUSCH in one or more subframes after a predetermined number of subframes. The predetermined number can be an integer greater than or equal to zero. The predetermined number may be predefined or determined based on physical layer signaling and/or RRC signaling. In multi-subframe scheduling, consecutive subframes may be scheduled, or subframes having a predetermined period may be scheduled. The number of scheduled subframes may be predefined or determined based on physical layer signaling and/or RRC signaling.

In cross-subframe scheduling, one DCI performs resource allocation in one subframe. Specifically, PDCCH or EPDCCH in a certain subframe is scheduled for PDSCH in one subframe a predetermined number of times after the subframe. PDCCH or EPDCCH in a certain subframe performs scheduling for PUSCH in one subframe a predetermined number of times later than that subframe. The predetermined number can be an integer greater than or equal to zero. The predetermined number may be predefined or determined based on physical layer signaling and/or RRC signaling. In cross-subframe scheduling, consecutive subframes may be scheduled, or subframes having a predetermined period may be scheduled.

In semi-persistent scheduling (SPS), one DCI performs resource allocation in one or more subframes. When information regarding SPS is set by RRC signaling and the terminal device 2 detects a PDCCH or EPDCCH for enabling SPS, the terminal device 2 enables processing regarding SPS and selects a predetermined PDSCH and/or PUSCH based on the settings regarding SPS. receive. If the terminal device 2 detects a PDCCH or EPDCCH for releasing SPS when SPS is valid, it releases (invalidates) SPS and stops receiving the predetermined PDSCH and/or PUSCH. The SPS may be released based on satisfying predetermined conditions. For example, when a predetermined number of empty transmission data is received, the SPS is released. An empty transmission of data to release SPS corresponds to a MAC PDU (Protocol Data Unit) containing zero MAC SDU (Service Data Unit).

Information regarding SPS through RRC signaling includes information regarding the SPS C-RNTI, which is the SPS RNTI, information regarding the scheduled period (interval) of PDSCH, information regarding the scheduled period (interval) of PUSCH, and settings for releasing SPS. information and/or the number of HARQ processes in the SPS. SPS is supported only on primary cells and/or primary secondary cells.

<HARQ in this embodiment>
In this embodiment, HARQ has various characteristics. HARQ transmits and retransmits transport blocks. In HARQ, a predetermined number of processes (HARQ processes) are used (configured), and each of the processes operates independently in a stop-and-wait manner.

In the downlink, HARQ is asynchronous and operates adaptively. That is, in the downlink, retransmissions are always scheduled over the PDCCH. Uplink HARQ-ACK (response information) corresponding to downlink transmission is transmitted on PUCCH or PUSCH. In the downlink, the PDCCH notifies the HARQ process number indicating the HARQ process and information indicating whether the transmission is initial transmission or retransmission.

On the uplink, HARQ operates synchronously or asynchronously. Downlink HARQ-ACK (response information) corresponding to uplink transmission is transmitted on PHICH, PDSCH, or PDCCH. In uplink HARQ, the operation of a terminal is determined based on the HARQ feedback received by the terminal and/or the PDCCH received by the terminal. For example, if PDCCH is not received and the HARQ feedback is ACK, the terminal device does not transmit (retransmit) and retains the data in the HARQ buffer. In that case, PDCCH may be transmitted to resume retransmission. Further, for example, if PDCCH is not received and HARQ feedback is NACK, the terminal device non-adaptively retransmits in a predetermined uplink subframe. Further, for example, when a PDCCH is received, the terminal device performs transmission or retransmission based on the content notified on the PDCCH, regardless of the content of the HARQ feedback.

Note that in the uplink, if a predetermined condition (setting) is satisfied, HARQ may operate only asynchronously. That is, downlink HARQ-ACK may not be transmitted, and retransmissions on the uplink may always be scheduled over the PDCCH.

In HARQ-ACK reporting, HARQ-ACK indicates ACK, NACK, or DTX. If HARQ-ACK is ACK, this indicates that the transport block (codeword, channel) corresponding to the HARQ-ACK has been correctly received (decoded). If the HARQ-ACK is a NACK, this indicates that the transport block (codeword, channel) corresponding to the HARQ-ACK could not be correctly received (decoded). If the HARQ-ACK is DTX, it indicates that the transport block (codeword, channel) corresponding to the HARQ-ACK does not exist (has not been transmitted).

Further, transmission (notification) of HARQ-ACK (response information) can be performed using various processing units. For example, HARQ-ACK can be sent for each transport block, codeword, code block, or code block group. Here, a transport block and a codeword can be a processing unit regarding a modulation method and/or a coding rate. One data channel can transmit up to two transport blocks and codewords. Further, a code block can be a processing unit of an error correction code such as a turbo code, a convolutional code, an LDPC (Low Density Parity Check) code, or a Polar code. One transport block includes one or more codewords. A maximum number of bits in one code block may be defined or set. The maximum number of bits may depend on the error correction code used, the size of the codeword and/or the type of channel. Further, a code block group includes one or more code blocks. In that case, one transport block includes one or more code block groups. The number of code blocks included in a code block group may be defined or set unique to a base station, cell, and/or terminal. The number may depend on the error correction code used, the size of the codeword and/or the type of channel.

A predetermined number of HARQ processes are configured (defined) in each of the downlink and uplink. For example, in FDD, up to eight HARQ processes are used per serving cell. Also, for example, in TDD, the maximum number of HARQ processes is determined by uplink/downlink settings. The maximum number of HARQ processes may be determined based on RTT (Round Trip Time). For example, if the RTT is 8 TTI, the maximum number of HARQ processes can be 8.

In this embodiment, HARQ information is composed of at least NDI (New Data Indicator) and TBS (Transport Block Size). NDI is information indicating whether the transport block corresponding to the HARQ information is an initial transmission or a retransmission. TBS is the transport block size. A transport block is a block of data in a transport channel (transport layer), and can be a unit for performing HARQ. In DL-SCH transmission, the HARQ information further includes a HARQ process ID (HARQ process number). In UL-SCH transmission, HARQ information further includes RV (Redundancy Version), which is information for specifying encoded information bits and parity bits for a transport block. In the case of spatial multiplexing on the DL-SCH, the HARQ information includes a set of NDI and TBS for each transport block.

<NR frame configuration (time domain) in this embodiment>
The NR frame structure can be defined by subframes, slots, and minislots. A subframe is composed of 14 symbols and can be used to define a frame configuration in a reference subcarrier interval (regular subcarrier interval). A slot is a symbol period at subcarrier intervals used for communication, and is composed of 7 or 14 symbols. The number of symbols constituting one slot can be set cell-specifically or terminal device-specifically by the base station device 1. A mini-slot may be made up of fewer symbols than the number of symbols making up the slot. For example, one minislot has a number of symbols from 1 to 6, and can be set cell-specifically or terminal device-specifically from the base station device 1. Both slots and minislots are used as units of time domain resources for communication. For example, slots are used for communication for eMBB and mmTC, and minislots are used for communication for URLLC. Further, the names of slots and minislots do not need to be distinguished.

FIG. 10 shows an example of the NR frame structure in this embodiment. FIG. 10 shows a frame configuration in a predetermined frequency domain. For example, the frequency domain includes resource blocks, subbands, system bandwidth, etc. Therefore, the frame structure as shown in FIG. 10 may be frequency multiplexed and/or spatially multiplexed.

In NR, one slot consists of downlink communication, guard period (GP), and/or downlink communication. Downlink communications include downlink channels such as NR-PDCCH and/or NR-PDSCH. Further, downlink transmission includes reference signals associated with NR-PDCCH and/or NR-PDSCH. Uplink communications include uplink channels such as NR-PUCCH and/or NR-PUSCH. Further, downlink communication includes reference signals associated with NR-PUCCH and/or NR-PUSCH. GP is a time domain in which nothing is transmitted. For example, the GP is used to adjust the time when the terminal device 2 switches from receiving downlink communication to transmitting uplink communication, the processing time in the terminal device 2, and/or the transmission timing of uplink communication.

As shown in FIG. 10, NR can use various frame configurations. FIG. 10(a) is composed of NR-PDCCH, NR-PDSCH, GP, and NR-PUCCH. The NR-PDCCH notifies the allocation information of the NR-PDSCH, and the HARQ-ACK for the received NR-PDSCH is notified by the NR-PUCCH in the same slot. FIG. 10(b) is composed of NR-PDCCH, GP and NR-PUSCH. NR-PDCCH notifies allocation information of NR-PUSCH, and NR-PUSCH is transmitted using allocated resources within the same slot. The frame configurations shown in FIGS. 10(a) and 10(b) are also called self-contained frames because downlink communication and uplink communication are completed within the same slot.

FIGS. 10(c) to (g) are slots configured with only downlink communication or only uplink communication. In FIG. 10(c), NR-PDSCH may be scheduled with NR-PDCCH within the same slot. In FIGS. 10(d) and (e), the NR-PDSCH and NR-PUSCH can be scheduled by NR-PDCCH mapped to different slots, RRC signaling, etc., respectively. In FIG. 10(h), the entire slot is used as a guard period and an area in which no communication is performed.

<Summary of uplink signal waveform in this embodiment>
In this embodiment, multiple types of signal waveforms are defined in the uplink. For example, two uplink signal waveforms may be defined, which may be a first signal waveform and a second signal waveform, respectively. In this embodiment, the first signal waveform is CP-OFDM (Cyclic Prefix - Orthogonal Frequency Division Multiplexing), and the second signal waveform is SC-FDMA (Single Carrier - Frequency Division Multiple Access). The second signal waveform is also called DFT-s-OFDM (Discrete Fourier Transform-Spread-Orthogonal Frequency Division Multiplexing).

That is, the first signal waveform is a multicarrier signal, and the second signal waveform is a single carrier signal. Further, the first signal waveform is the same as the downlink signal waveform in LTE and NR, and the second signal waveform is the same as the uplink signal waveform in LTE.

These signal waveforms can differ in terms of power efficiency, transmission efficiency, transmission (generation) method, reception method, resource mapping, etc. For example, the second signal waveform can reduce PAPR (Peak-to-Average Power Ratio) compared to the first signal waveform, and is therefore superior in terms of power efficiency. Further, the first signal waveform is superior in terms of transmission efficiency compared to the second signal waveform because the reference signal can be frequency-multiplexed with data in the frequency direction. Furthermore, in the reception processing for the second signal waveform, if it is necessary to perform frequency domain equivalence, the second signal waveform has a higher reception processing load than the first signal waveform. Further, since the first signal waveform has narrower subcarrier spacing than the second signal waveform, it is particularly susceptible to phase noise in a high frequency band.

<Summary of reliability control of response information for data in this embodiment>
In this embodiment, response information (HARQ-ACK) for data is transmitted using a predetermined transmission method regarding reliability. The predetermined transmission method may be determined depending on the reliability priority for the data.

Note that in the following description, data includes a data channel, and the data channel includes a downlink channel such as PDSCH and an uplink channel such as PUSCH. Further, the control channel is a physical channel for transmitting response information to data, and includes uplink channels such as PUCCH and PUSCH, and downlink channels such as PDCCH, PHICH and PDSCH. That is, the contents described in this embodiment are two cases: a base station device transmits a data channel and a terminal device transmits a control channel, and a case where a terminal device transmits a data channel and a base station device transmits a control channel. It can be carried out in both cases.

Also, as already explained, response information can be transmitted for each transport block, codeword, code block, or code block group, but for the sake of simplicity, in the following description, data and response information will be transmitted for each slot. Described as a channel or information.

FIG. 11 shows an example of reliability control of response information for data. In the figure, five slots with slot numbers #n to #n+4 are shown. Further, when a data channel in a predetermined slot is transmitted, response information in that data channel is transmitted in a control channel in the next slot. Therefore, the control channels in the slots with slot numbers #n to #n+4 transmit response information for the data in the slots with slot numbers #n-1 to #n+3, respectively.

Each of these pieces of response information is controlled with respect to its reliability priority, and is transmitted by a predetermined transmission method determined according to the reliability priority.

The reliability priority and the predetermined transmission method regarding reliability will be described later. Further, the predetermined transmission method regarding reliability is also simply referred to as a predetermined transmission method.

<Multiple response information that is repeatedly transmitted in this embodiment>
Response information for data may be repeatedly transmitted on multiple control channels. Further, in a certain control channel and/or slot, response information for data in a plurality of slots may be multiplexed. FIG. 12 shows an example.

In other words, in the control channel of a predetermined slot, the predetermined number of response information for data in a predetermined number of slots before the predetermined slot are multiplexed. Furthermore, any of the predetermined number of response information is repeatedly transmitted multiple times on different control channels. Further, the predetermined number of response information multiplexed in the predetermined slot is transmitted on one uplink physical channel.

Further, each of these pieces of response information is controlled with respect to its reliability priority, and is transmitted by a predetermined transmission method determined according to the reliability priority. The control may be performed for each slot or for each response information multiplexed within the same slot.

In the example of FIG. 12, the control channel in a certain slot multiplexes and transmits response information for data in three slots more recent than that slot.

<Reliability priority in this embodiment>
In this embodiment, the reliability priority is a priority regarding the reliability of response information. In this embodiment, reliability priority is also simply referred to as priority. Further, the reliability priority may be simply regarded as a parameter or value.

Reliability priority can be controlled in various units. For example, reliability priority can be controlled in units of response information, a group of predetermined response information, a control channel, a slot, a minislot, a subframe, a radio frame, a cell, and/or a base station.

Control of reliability priority (how to assign reliability priority) is performed according to various factors and/or parameters. A specific control method is any of the methods described below or a combination thereof.

As an example of a reliability priority control method, the reliability priority is determined according to the order of slots in which data is received (transmitted). In other words, reliability priority is given by data reception (transmission) timing. For example, response information for a temporally new slot has a high reliability priority.

As another example of a reliability priority control method, the reliability priority is determined based on the notified HARQ timing. Here, the HARQ timing is the timing of transmitted data and response information for the data, and the HARQ timing can be notified by RRC signaling and/or PDCCH signaling. In other words, reliability priority is given by at least the timing of transmitting response information with respect to receiving data. For example, response information with a short HARQ timing has a high reliability priority. For example, when data and its response information are transmitted and received within the same slot, the reliability priority of the response information is set high.

As another example of a reliability priority control method, the reliability priority is determined based on the number of repetitions of response information. In other words, the reliability priority is given by at least the number of repeated transmissions of response information. For example, response information that has been transmitted a large number of times up to that point is given a high reliability priority. Further, for example, response information that is set or notified a large number of times is given a high reliability priority.

As another example of a reliability priority control method, reliability priority is determined based on the type of channel corresponding to response information. For example, response information for a control channel has a high reliability priority, and response information for a data channel has a low reliability priority.

As another example of a reliability priority control method, the reliability priority is notified or set from the base station. For example, reliability priority is determined for each data channel and included in control information that allocates that data channel. In other words, reliability priority is given by control information for at least said data channel.

As another example of a reliability priority control method, reliability priority is determined based on the size of data. For example, reliability priority is increased as the size of data becomes larger. For example, the size of data is the number of resource blocks, the size of a transport block (number of bits), the size of a code block (number of bits), or the size of a code block group (number of bits).

As another example of a method for controlling reliability priority, reliability priority is determined based on a HARQ process. For example, the reliability priority is increased as the number of HARQ processes becomes smaller. Further, for example, the reliability priority is set high when the number is a predetermined HARQ process. The number of a given HARQ process is 0.

<Predetermined transmission method regarding reliability in this embodiment>
In this embodiment, a predetermined transmission method regarding reliability is controlled based on reliability priority. For example, response information with a high reliability priority is transmitted using a highly reliable transmission method.

An example of a predetermined transmission method regarding reliability is a method regarding repeated transmission. For example, response information with a high reliability priority is transmitted by increasing the number of repeated transmissions. This repeated transmission may be performed in the frequency direction and/or the time direction. Note that this repeated transmission may be performed using separate control channels, or may be performed within the same control channel.

FIG. 13 is a diagram illustrating an example of reliability control regarding the number of repeated transmissions. The number of repeated transmissions is determined for each data based on the reliability priority. In the example of FIG. 13, the number of repeated transmissions for response information of data A, B, and C is 2, 3, and 1, respectively. In this case, the response information of data A is transmitted on the control channel of slot #n+1, the response information of data A and the response information of data B are multiplexed and transmitted on the control channel of slot #n+2, and The response information of data B is transmitted on the control channel of slot #n+3, and the response information of data B and the response information of data C are multiplexed and transmitted on the control channel of slot #n+4.

Another example of a predetermined transmission method regarding reliability is a method regarding error correction codes. For example, response information with a high reliability priority is transmitted with a low coding rate in an error correction code (with a high coding gain). Furthermore, for example, response information with a high reliability priority is transmitted using an error correction code with a high coding gain.

Another example of a predetermined transmission method regarding reliability is a method regarding transmission power. For example, response information with a high reliability priority is transmitted with high transmission power. The transmit power is determined based on at least a predefined index and/or a predefined offset value, and the index and/or offset value is determined based on the reliability priority.

Another example of a predetermined transmission method regarding reliability is a method regarding modulation schemes. For example, response information with a high reliability priority is transmitted using a modulation method with a low modulation level (modulation order). Specifically, the modulation methods are BPSK, QPSK, 16QAM, 64QAM, 256QAM, and 1024QAM in descending order of modulation level. Furthermore, in BPSK, the phase may be shifted by π/2 for each symbol.

Another example of a predetermined transmission method regarding reliability is a method regarding resource element mapping. For example, response information with a high reliability priority is mapped to a highly reliable resource element and transmitted. Highly reliable resource elements are resource elements around the resource element to which the reference signal is mapped. Specifically, response information with a high reliability priority is mapped to a resource element adjacent to a resource element to which a reference signal is mapped and transmitted. As a result, response information with a high reliability priority increases the accuracy of transmission path estimation on the receiving side.

Another example of a predetermined transmission method regarding reliability is a method regarding the size of resources used for transmission. For example, response information with a high reliability priority is transmitted using a large-sized resource. The resources here are the number of PRBs, the number of symbols, and/or the number of resource elements. Thereby, response information with a high reliability priority can be transmitted with a high coding gain.

Another example of a predetermined transmission method regarding reliability is a method regarding signal waveforms. For example, response information with a high reliability priority is transmitted using a highly reliable signal waveform. The reliability of the signal waveform may be determined from the viewpoint of PAPR. Specifically, the highly reliable signal waveform is the second signal waveform.

Another example of a predetermined transmission method regarding reliability is a method regarding the type of control channel used for transmission. For example, response information with a high reliability priority is transmitted on a first control channel, and response information with a low reliability priority is transmitted on a second control channel. The difference between the first control channel and the second control channel is the number of symbols that can be used for transmission. The first control channel is transmitted using resources of four or more symbols, and the second control channel is transmitted using resources of one or two symbols. The first control channel is also called long PUCCH, and the second control channel is also called short PUCCH. Further, the first control channel may be mapped somewhere within the slot, and the second control channel may be mapped only to the last slot within the slot. As a result, response information with a high reliability priority can be transmitted with a large resource size used for transmission and with a high coding gain.

<Number of multiplexed response information in this embodiment>
As already explained, in this embodiment, one or more pieces of response information may be multiplexed in a certain slot and/or control channel. The multiplexing number may be defined in advance or may be set by the base station. Further, the multiplexing number is the number actually multiplexed, and can be determined based on various conditions, parameters, and/or elements.

For example, the number of multiplexed response information is determined based on at least the maximum number of multiplexed response information. The maximum number of multiplexed response information may be defined in advance, or may be set by the base station.

As an example of a method for determining the number of multiplexes of response information, the number of multiplexes of response information is the maximum number of multiplexes of response information, regardless of actual data reception. At this time, response information without actual data reception can be DTX.

For example, using the example of FIG. 12, consider multiplexing of response information on the control channel of slot #n+3 when the maximum number of response information multiplexes is set to 3. If data is received in slot #n+1 and no data is received in slots #n and #n+2, the control channel in slot #n+3 will receive three response information (one ACK or NACK, and two DTX) are multiplexed.

Further, in a certain control channel, if all the multiplexed response information is DTX, that control channel does not need to be transmitted.

As another example of a method for determining the number of multiplexed response information, the number of multiplexed response information is determined based on the number of response information of actually received data and the maximum number of multiplexed response information.

If the number of response information for actually received data is less than or equal to the maximum number of multiplexes of response information, the number of multiplexes of response information is the number of response information for actually received data.

If the number of response information of the actually received data exceeds the maximum number of multiplexes of response information, the number of multiplexes of response information is set to be equal to or less than the maximum number of multiplexes of response information. Furthermore, in this case, various methods can be used to reduce the number of response information pieces of actually received data to the maximum number of response information multiplexes.

As an example of a reduction method, response information with a low reliability priority may be bundled. Here, bundling of response information means combining a plurality of pieces of response information into one piece of response information by ANDing, and when all of the response information to be bundled is ACK, the information becomes ACK.

As an example of a reduction method, response information with a low reliability priority may be dropped. Here, dropping response information means not transmitting the response information. Furthermore, dropping of response information may be determined further based on the number of repeated transmissions. For example, response information is dropped preferentially to response information that has been repeatedly transmitted a large number of times.

Further, if the number of response information of data actually received exceeds the maximum number of multiplexed response information, the resource and/or channel for transmitting the response information may be changed and transmitted. That is, when the number of response information of the actually received data is less than or equal to the maximum number of multiplexed response information (a predetermined value that is set), the response information is transmitted on the second control channel (short PUCCH). If the number of response information of actually received data exceeds the maximum number of multiplexed response information (a predetermined value set), the response information is transmitted on the first control channel (long PUCCH).

Further, the terminal device may be configured not to assume a case where the number of response information of data actually received exceeds the maximum number of multiplexes of response information. That is, the base station apparatus performs control (scheduling) on the terminal apparatus so that the number of response information of actually received data does not exceed the maximum number of multiplexed response information.

<Resources of control channel for transmitting response information in this embodiment>
As already explained, in this embodiment, the response information is transmitted through a predetermined control channel or the like. The control channel resources used for transmitting the response information are determined by a predetermined method. Here, the control channel resources include physical resources or logical resources. Control channel resources are determined by any of the methods described below or a combination thereof.

As an example of a method for determining control channel resources, control channel resources are notified by RRC signaling and/or DCI signaling. For example, a plurality of candidates for control channel resources are set by RRC signaling, and DCI signaling notifies control information for selecting from these candidates.

As another example of a method for determining control channel resources, the control channel resources are determined based on data corresponding to response information transmitted on the control channel. For example, PDCCH resource information (for example, the first CCE number) that notifies the data allocation information is used. Furthermore, when a plurality of pieces of response information are multiplexed, control channel resources may be determined based on temporally latest received data or received data with the highest reliability priority.

As another example of a method for determining control channel resources, the control channel resources are determined based on the number of times response information is multiplexed. For example, if the number of response information multiplexes is less than or equal to a predetermined value, the control channel resource is the first resource, and if the response information multiplex number exceeds the predetermined value, the control channel resource is the second resource. . The predetermined value may be defined in advance or may be set by the base station. Furthermore, the first resource and the second resource have different numbers of multiplexed response information that can be transmitted.

<Details of repeated transmission of response information in this embodiment>
As already explained, in this embodiment, response information can be repeatedly transmitted. The number of repeated transmissions may be determined based on reliability priority, as described above. Further, the number of repeated transmissions may be notified by RRC signaling and/or DCI signaling.

Further, if the data is retransmitted while the response information for certain data is being repeatedly transmitted, the repeated transmission of the response information is stopped after a predetermined slot. The data can be identified by the HARQ process number. The predetermined slot is a slot in which the data was retransmitted, a slot next to the slot in which the data was retransmitted, or a slot a predetermined number of times after the slot in which the data was retransmitted.

<Application of uplink signal waveform to sidelink in this embodiment>
The content described in this embodiment can also be applied to side link communication. The reliability of response information for data in NR sidelink communication can be controlled by the method described in this embodiment. That is, in the description of this embodiment, uplink can be read as sidelink.

In addition to the above, reliability control of response information for data in sidelinks can be set independently for each predetermined resource pool.

<Terminal capability information regarding uplink signal waveform in this embodiment>
In this embodiment, the terminal device 2 can notify the base station device 1 of terminal capability information indicating the functions and capabilities that the terminal device 2 has. The base station device 1 can recognize the functions and capabilities of the terminal device 2 based on the terminal capability information, and is used for setting and scheduling the terminal device 2. For example, the terminal capability information includes information indicating functions and capabilities related to reliability control of response information for data.

<Application example>
[Application example regarding base station]
(First application example)
FIG. 14 is a block diagram illustrating a first example of a schematic configuration of an eNB to which the technology according to the present disclosure can be applied. eNB 800 has one or more antennas 810 and base station device 820. Each antenna 810 and base station device 820 may be connected to each other via an RF cable.

Each of the antennas 810 has a single antenna element or a plurality of antenna elements (for example, a plurality of antenna elements forming a MIMO antenna), and is used by the base station apparatus 820 for transmitting and receiving radio signals. The eNB 800 has a plurality of antennas 810 as shown in FIG. 14, and the plurality of antennas 810 may each correspond to a plurality of frequency bands used by the eNB 800, for example. Note that although FIG. 14 shows an example in which the eNB 800 has a plurality of antennas 810, the eNB 800 may have a single antenna 810.

The base station device 820 includes a controller 821, a memory 822, a network interface 823, and a wireless communication interface 825.

The controller 821 may be, for example, a CPU or a DSP, and operates various functions of upper layers of the base station device 820. For example, controller 821 generates data packets from data in signals processed by wireless communication interface 825 and forwards the generated packets via network interface 823. The controller 821 may generate a bundled packet by bundling data from multiple baseband processors, and may transfer the generated bundled packet. The controller 821 also includes logic that executes control such as radio resource control, radio bearer control, mobility management, admission control, or scheduling. It may also have similar functions. Further, the control may be executed in cooperation with surrounding eNBs or core network nodes. Memory 822 includes RAM and ROM, and stores programs executed by controller 821 and various control data (eg, terminal list, transmission power data, scheduling data, etc.).

Network interface 823 is a communication interface for connecting base station device 820 to core network 824. Controller 821 may communicate with core network nodes or other eNBs via network interface 823. In that case, the eNB 800 and the core network node or other eNB may be connected to each other by a logical interface (for example, an S1 interface or an X2 interface). Network interface 823 may be a wired communication interface or may be a wireless communication interface for wireless backhaul. If network interface 823 is a wireless communication interface, network interface 823 may use a higher frequency band for wireless communication than the frequency band used by wireless communication interface 825.

Wireless communication interface 825 supports any cellular communication method such as LTE (Long Term Evolution) or LTE-Advanced, and provides wireless connectivity to terminals located within the cell of eNB 800 via antenna 810. Wireless communication interface 825 may typically include a baseband (BB) processor 826, RF circuitry 827, and the like. The BB processor 826 may perform, for example, encoding/decoding, modulation/demodulation, multiplexing/demultiplexing, etc., and performs each layer (for example, L1, MAC (Medium Access Control), RLC (Radio Link Control), and PDCP). (Packet Data Convergence Protocol)). The BB processor 826 may have some or all of the above-mentioned logical functions instead of the controller 821. The BB processor 826 may be a module including a memory that stores a communication control program, a processor that executes the program, and related circuits, and the functions of the BB processor 826 may be changed by updating the program. good. Furthermore, the module may be a card or blade inserted into a slot of the base station device 820, or a chip mounted on the card or blade. Meanwhile, the RF circuit 827 may include a mixer, a filter, an amplifier, etc., and transmits and receives wireless signals via the antenna 810.

The wireless communication interface 825 includes a plurality of BB processors 826 as shown in FIG. 14, and the plurality of BB processors 826 may each correspond to a plurality of frequency bands used by the eNB 800, for example. Further, the wireless communication interface 825 includes a plurality of RF circuits 827 as shown in FIG. 14, and the plurality of RF circuits 827 may each correspond to, for example, a plurality of antenna elements. Although FIG. 14 shows an example in which the wireless communication interface 825 includes a plurality of BB processors 826 and a plurality of RF circuits 827, the wireless communication interface 825 does not include a single BB processor 826 or a single RF circuit 827. But that's fine.

(Second application example)
FIG. 15 is a block diagram illustrating a second example of a schematic configuration of an eNB to which the technology according to the present disclosure can be applied. eNB 830 has one or more antennas 840, base station device 850, and RRH 860. Each antenna 840 and RRH 860 may be connected to each other via an RF cable. Furthermore, the base station device 850 and the RRH 860 can be connected to each other via a high-speed line such as an optical fiber cable.

Each of the antennas 840 has a single antenna element or a plurality of antenna elements (for example, a plurality of antenna elements forming a MIMO antenna), and is used for transmitting and receiving radio signals by the RRH 860. The eNB 830 has a plurality of antennas 840 as shown in FIG. 15, and the plurality of antennas 840 may each correspond to a plurality of frequency bands used by the eNB 830, for example. Note that although FIG. 15 shows an example in which the eNB 830 has a plurality of antennas 840, the eNB 830 may have a single antenna 840.

The base station device 850 includes a controller 851, a memory 852, a network interface 853, a wireless communication interface 855, and a connection interface 857. The controller 851, memory 852, and network interface 853 are similar to the controller 821, memory 822, and network interface 823 described with reference to FIG.

Wireless communication interface 855 supports any cellular communication scheme, such as LTE or LTE-Advanced, and provides wireless connectivity to terminals located within the sector corresponding to RRH 860 via RRH 860 and antenna 840. Wireless communication interface 855 may typically include a BB processor 856 or the like. BB processor 856 is similar to BB processor 826 described with reference to FIG. 14, except that it is connected to RF circuit 864 of RRH 860 via connection interface 857. The wireless communication interface 855 includes a plurality of BB processors 856 as shown in FIG. 15, and the plurality of BB processors 856 may each correspond to a plurality of frequency bands used by the eNB 830, for example. Note that although FIG. 15 shows an example in which the wireless communication interface 855 includes a plurality of BB processors 856, the wireless communication interface 855 may include a single BB processor 856.

The connection interface 857 is an interface for connecting the base station device 850 (wireless communication interface 855) to the RRH 860. The connection interface 857 may be a communication module for communication over the above-mentioned high-speed line that connects the base station device 850 (wireless communication interface 855) and the RRH 860.

The RRH 860 also includes a connection interface 861 and a wireless communication interface 863.

The connection interface 861 is an interface for connecting the RRH 860 (wireless communication interface 863) to the base station device 850. The connection interface 861 may be a communication module for communication over the above-mentioned high-speed line.

Wireless communication interface 863 transmits and receives wireless signals via antenna 840. Wireless communication interface 863 may typically include RF circuit 864 and the like. RF circuit 864 may include a mixer, filter, amplifier, etc., and transmits and receives radio signals via antenna 840. The wireless communication interface 863 includes a plurality of RF circuits 864 as shown in FIG. 15, and the plurality of RF circuits 864 may each correspond to, for example, a plurality of antenna elements. Note that although FIG. 15 shows an example in which the wireless communication interface 863 includes a plurality of RF circuits 864, the wireless communication interface 863 may include a single RF circuit 864.

The eNB 800, eNB 830, base station device 820, or base station device 850 shown in FIGS. 14 and 15 may correspond to the base station device 1 described with reference to FIG. 8 and the like.

[Application example regarding terminal device]
(First application example)
FIG. 16 is a block diagram illustrating an example of a schematic configuration of a smartphone 900 as a terminal device 2 to which the technology according to the present disclosure can be applied. The smartphone 900 includes a processor 901, a memory 902, a storage 903, an external connection interface 904, a camera 906, a sensor 907, a microphone 908, an input device 909, a display device 910, a speaker 911, a wireless communication interface 912, and one or more antenna switches 915. , one or more antennas 916 , a bus 917 , a battery 918 and an auxiliary controller 919 .

Processor 901 may be, for example, a CPU or SoC (System on Chip), and controls functions of the application layer and other layers of smartphone 900. Memory 902 includes RAM and ROM, and stores programs and data executed by processor 901. Storage 903 may include a storage medium such as a semiconductor memory or a hard disk. The external connection interface 904 is an interface for connecting an external device such as a memory card or a USB (Universal Serial Bus) device to the smartphone 900.

The camera 906 includes an image sensor such as a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor), and generates a captured image. The sensor 907 may include a group of sensors such as a positioning sensor, a gyro sensor, a geomagnetic sensor, and an acceleration sensor. Microphone 908 converts audio input to smartphone 900 into an audio signal. The input device 909 includes, for example, a touch sensor that detects a touch on the screen of the display device 910, a keypad, a keyboard, buttons, or switches, and receives operations or information input from the user. The display device 910 has a screen such as a liquid crystal display (LCD) or an organic light emitting diode (OLED) display, and displays the output image of the smartphone 900. Speaker 911 converts the audio signal output from smartphone 900 into audio.

The wireless communication interface 912 supports any cellular communication method such as LTE or LTE-Advanced and performs wireless communication. The wireless communication interface 912 may typically include a BB processor 913, an RF circuit 914, and the like. BB processor 913 may perform, for example, encoding/decoding, modulation/demodulation, and multiplexing/demultiplexing, and performs various signal processing for wireless communications. On the other hand, the RF circuit 914 may include a mixer, a filter, an amplifier, etc., and transmits and receives wireless signals via an antenna 916. The wireless communication interface 912 may be a one-chip module that integrates a BB processor 913 and an RF circuit 914. The wireless communication interface 912 may include multiple BB processors 913 and multiple RF circuits 914, as shown in FIG. Although FIG. 16 shows an example in which the wireless communication interface 912 includes a plurality of BB processors 913 and a plurality of RF circuits 914, the wireless communication interface 912 does not include a single BB processor 913 or a single RF circuit 914. But that's fine.

Furthermore, the wireless communication interface 912 may support other types of wireless communication methods, such as a short-range wireless communication method, a close-range wireless communication method, or a wireless LAN (Local Area Network) method, in addition to the cellular communication method. In that case, a BB processor 913 and an RF circuit 914 may be included for each wireless communication method.

Each of the antenna switches 915 switches the connection destination of the antenna 916 between a plurality of circuits (for example, circuits for different wireless communication systems) included in the wireless communication interface 912.

Each of the antennas 916 has a single antenna element or multiple antenna elements (eg, multiple antenna elements that constitute a MIMO antenna), and is used for transmitting and receiving wireless signals by the wireless communication interface 912. Smartphone 900 may have multiple antennas 916 as shown in FIG. 16. Note that although FIG. 16 shows an example in which the smartphone 900 has a plurality of antennas 916, the smartphone 900 may have a single antenna 916.

Furthermore, the smartphone 900 may include an antenna 916 for each wireless communication method. In that case, antenna switch 915 may be omitted from the configuration of smartphone 900.

Bus 917 connects processor 901, memory 902, storage 903, external connection interface 904, camera 906, sensor 907, microphone 908, input device 909, display device 910, speaker 911, wireless communication interface 912, and auxiliary controller 919 to each other. . The battery 918 supplies power to each block of the smartphone 900 shown in FIG. 16 via power supply lines partially indicated by broken lines in the figure. For example, the auxiliary controller 919 operates the minimum necessary functions of the smartphone 900 in sleep mode.

(Second application example)
FIG. 17 is a block diagram illustrating an example of a schematic configuration of a car navigation device 920 to which the technology according to the present disclosure can be applied. The car navigation device 920 includes a processor 921, a memory 922, a GPS (Global Positioning System) module 924, a sensor 925, a data interface 926, a content player 927, a storage medium interface 928, an input device 929, a display device 930, a speaker 931, and wireless communication. It includes an interface 933, one or more antenna switches 936, one or more antennas 937, and a battery 938.

Processor 921 may be, for example, a CPU or SoC, and controls navigation functions and other functions of car navigation device 920. Memory 922 includes RAM and ROM, and stores programs and data executed by processor 921.

GPS module 924 measures the position (eg, latitude, longitude, and altitude) of car navigation device 920 using GPS signals received from GPS satellites. Sensor 925 may include a group of sensors such as a gyro sensor, a geomagnetic sensor, and a barometric pressure sensor, for example. The data interface 926 is connected to the in-vehicle network 941 via a terminal (not shown), for example, and acquires data generated on the vehicle side, such as vehicle speed data.

Content player 927 plays content stored on a storage medium (eg, a CD or DVD) inserted into storage medium interface 928 . The input device 929 includes, for example, a touch sensor that detects a touch on the screen of the display device 930, a button, or a switch, and receives operations or information input from the user. Display device 930 has a screen, such as an LCD or OLED display, and displays navigation functions or images of the content being played. The speaker 931 outputs the audio of the navigation function or the content to be played.

The wireless communication interface 933 supports any cellular communication method such as LTE or LTE-Advanced, and performs wireless communication. The wireless communication interface 933 may typically include a BB processor 934, an RF circuit 935, and the like. BB processor 934 may perform various signal processing for wireless communications, such as encoding/decoding, modulation/demodulation, and multiplexing/demultiplexing. On the other hand, the RF circuit 935 may include a mixer, a filter, an amplifier, etc., and transmits and receives wireless signals via an antenna 937. The wireless communication interface 933 may be a one-chip module that integrates a BB processor 934 and an RF circuit 935. The wireless communication interface 933 may include multiple BB processors 934 and multiple RF circuits 935, as shown in FIG. Although FIG. 17 shows an example in which the wireless communication interface 933 includes a plurality of BB processors 934 and a plurality of RF circuits 935, the wireless communication interface 933 does not include a single BB processor 934 or a single RF circuit 935. But that's fine.

Additionally, the wireless communication interface 933 may support other types of wireless communication methods, such as short-range wireless communication methods, close proximity wireless communication methods, or wireless LAN methods, in addition to cellular communication methods, in which case the wireless communication It may also include a BB processor 934 and an RF circuit 935 for each communication method.

Each of the antenna switches 936 switches the connection destination of the antenna 937 between a plurality of circuits (for example, circuits for different wireless communication systems) included in the wireless communication interface 933.

Each of the antennas 937 has a single antenna element or a plurality of antenna elements (for example, a plurality of antenna elements forming a MIMO antenna), and is used for transmitting and receiving wireless signals by the wireless communication interface 933. Car navigation device 920 may have multiple antennas 937 as shown in FIG. Note that although FIG. 17 shows an example in which the car navigation device 920 has a plurality of antennas 937, the car navigation device 920 may have a single antenna 937.

Furthermore, the car navigation device 920 may include an antenna 937 for each wireless communication method. In that case, the antenna switch 936 may be omitted from the configuration of the car navigation device 920.

The battery 938 supplies power to each block of the car navigation device 920 shown in FIG. 17 via power supply lines partially indicated by broken lines in the figure. Further, the battery 938 stores electric power supplied from the vehicle side.

Further, the technology according to the present disclosure may be realized as an in-vehicle system (or vehicle) 940 that includes one or more blocks of the above-described car navigation device 920, an in-vehicle network 941, and a vehicle-side module 942. The vehicle-side module 942 generates vehicle-side data such as vehicle speed, engine speed, or failure information, and outputs the generated data to the in-vehicle network 941.

Note that the effects described in this specification are merely explanatory or illustrative, and are not limiting. In other words, the technology according to the present disclosure can have other effects that are obvious to those skilled in the art from the description of this specification, in addition to or in place of the above effects.

Note that the following configurations also belong to the technical scope of the present disclosure.
(1)
A terminal device that communicates with a base station device,
a receiver for receiving a data channel containing one or more data;
A terminal device comprising: a transmitter that transmits response information to the data based on a parameter regarding reliability of the data.
(2)
The terminal device according to (1), wherein the response information is repeatedly transmitted on a predetermined number of different control channels.
(3)
The terminal device according to (2), wherein the predetermined number is determined based on the reliability-related parameter.
(4)
The terminal device according to (2) or (3) above, which stops repeated transmission of the response information when retransmission of the data is received.
(5)
The terminal device according to any one of (2) to (4), wherein a plurality of pieces of response information for different pieces of data are multiplexed and transmitted on each of the control channels.
(6)
The terminal device according to (5), wherein the number of pieces of response information is determined based on at least a maximum multiplexing number set by the base station device.
(7)
The terminal device according to (5), wherein the control channel is determined based on the number of the plurality of pieces of response information.
(8)
The terminal device according to any one of (1) to (7), wherein the reliability-related parameter is given by at least the reception timing of the data.
(9)
The terminal device according to any one of (1) to (7), wherein the reliability-related parameter is given by at least the transmission timing of the response information in response to reception of the data.
(10)
The terminal device according to any one of (1) to (7), wherein the reliability-related parameter is given by at least the number of times response information is repeatedly transmitted.
(11)
The terminal device according to any one of (1) to (7), wherein the reliability-related parameter is given by at least control information for the data channel.
(12)
The terminal device according to any one of (1) to (11), wherein the reliability-related parameter controls a coding rate of the response information.
(13)
The terminal device according to any one of (1) to (11), wherein the reliability-related parameter controls the size of a resource used for transmitting the response information.
(14)
A base station device that communicates with a terminal device,
a transmitter for transmitting a data channel containing one or more data;
A base station apparatus, comprising: a receiving unit that receives response information for the data based on a parameter regarding reliability of the data.
(15)
A communication method used in a terminal device communicating with a base station device, the method comprising:
receiving a data channel containing one or more data;
A communication method comprising: transmitting response information for the data based on a parameter regarding reliability of the data.
(16)
A communication method used in a base station device communicating with a terminal device, the method comprising:
transmitting a data channel containing one or more data;
A communication method comprising: receiving response information for the data based on a parameter regarding reliability of the data.
(17)
computer,
a receiver for receiving a data channel containing one or more data;
A recording medium having recorded thereon a program for functioning as a transmitter that transmits response information to the data based on a parameter related to reliability of the data.
(18)
computer,
a transmitter for transmitting a data channel containing one or more data;
A recording medium having recorded thereon a program for functioning as a receiving unit that receives response information for the data based on a parameter regarding reliability of the data.

1 Base station device 101 Upper layer processing section 103 Control section 105 Receiving section 107 Transmitting section 2 Terminal device 201 Upper layer processing section 203 Control section 205 Receiving section 207 Transmitting section

Claims (10)

A terminal device that communicates with a base station device,
a downlink control channel for scheduling a downlink data channel including one or more data; and a receiving unit for receiving the downlink data channel;
Response information for the data is transmitted by a first uplink control channel or a second uplink control channel, which is a priority notified by the downlink control channel and is determined based on the priority for the downlink data channel. and a transmitter for transmitting,
If the priority is high, the response information is transmitted by the first uplink control channel; if the priority is low, the response information is transmitted by the second uplink control channel;
The response information is repeatedly transmitted in different slots in the first uplink control channel or the second uplink control channel for a number of times notified by RRC signaling. The terminal device according to claim 1, wherein a modulation scheme used for the first uplink control channel and a modulation scheme used for the second uplink control channel are set independently. The terminal device according to claim 1, wherein the size of the resource used for the first uplink control channel and the size of the resource used for the second uplink control channel are set independently. The terminal device according to claim 1, wherein the number of symbols used for the first uplink control channel and the number of symbols used for the second uplink control channel are independently set. The terminal device according to claim 1, wherein the number of repeated transmissions used for the first uplink control channel and the number of repeated transmissions used for the second uplink control channel are independently set. A base station device that communicates with a terminal device,
a downlink control channel for scheduling a downlink data channel including one or more data; a transmitter for transmitting the downlink data channel;
Response information for the data is transmitted by a first uplink control channel or a second uplink control channel, which is a priority notified by the downlink control channel and is determined based on the priority for the downlink data channel. and a receiving section for receiving the data.
If the priority is high, the response information is transmitted by the first uplink control channel; if the priority is low, the response information is transmitted by the second uplink control channel;
The base station apparatus, wherein the response information is repeatedly transmitted in different slots in the first uplink control channel or the second uplink control channel, a number of times notified by RRC signaling. A communication method used in a terminal device communicating with a base station device, the method comprising:
receiving a downlink control channel for scheduling a downlink data channel including one or more data, and the downlink data channel;
Response information for the data is transmitted by a first uplink control channel or a second uplink control channel, which is a priority notified by the downlink control channel and is determined based on the priority for the downlink data channel. sending and having;
If the priority is high, the response information is transmitted by the first uplink control channel; if the priority is low, the response information is transmitted by the second uplink control channel;
The response information is repeatedly transmitted in different slots in the first uplink control channel or the second uplink control channel, a number of times notified by RRC signaling. A communication method used in a base station device communicating with a terminal device, the method comprising:
a downlink control channel for scheduling a downlink data channel including one or more data; and transmitting the downlink data channel;
Response information for the data is transmitted by a first uplink control channel or a second uplink control channel, which is a priority notified by the downlink control channel and is determined based on the priority for the downlink data channel. receiving and having;
If the priority is high, the response information is transmitted by the first uplink control channel; if the priority is low, the response information is transmitted by the second uplink control channel;
The response information is repeatedly transmitted in different slots in the first uplink control channel or the second uplink control channel, a number of times notified by RRC signaling. computer,
a downlink control channel for scheduling a downlink data channel including one or more data; and a receiving unit for receiving the downlink data channel;
Response information for the data is transmitted by a first uplink control channel or a second uplink control channel, which is a priority notified by the downlink control channel and is determined based on the priority for the downlink data channel. A transmitter for transmitting data, and a program for functioning as a transmitter,
If the priority is high, the response information is transmitted by the first uplink control channel; if the priority is low, the response information is transmitted by the second uplink control channel;
The response information is repeatedly transmitted in different slots in the first uplink control channel or the second uplink control channel for a number of times notified by RRC signaling. computer,
a downlink control channel for scheduling a downlink data channel including one or more data; a transmitter for transmitting the downlink data channel;
Response information for the data is transmitted by a first uplink control channel or a second uplink control channel, which is a priority notified by the downlink control channel and is determined based on the priority for the downlink data channel. A receiving unit for receiving data, and a program for functioning as a receiving unit,
If the priority is high, the response information is transmitted by the first uplink control channel; if the priority is low, the response information is transmitted by the second uplink control channel;
The response information is repeatedly transmitted in different slots in the first uplink control channel or the second uplink control channel for a number of times notified by RRC signaling.

Images